Committing days 1-4

01/01-part2.c

@@ -0,0 +1,133 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+// How much memory to allocate for each line
+#define MAX_LINE_LEN 200
+
+#define DEFAULT_FILE "input.txt"
+
+// Returns 0 if a string is not a number (e.g. 'two')
+// Otherwise, returns the equivilant ascii character digit.
+// Only works for single digits.
+// Only accepts lower case.
+char parse_num(char *str)
+{
+    const char *num_strings[10] =  { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
+
+    // The lengths of the strings above, 
+    const uint8_t num_string_lens[10] =  { 4, 3, 3, 5, 4, 4, 3, 5, 5, 4 };
+
+    bool possible_nums[10] = { [0 ... 9] = true };
+    uint8_t num_idx = 0;
+    uint8_t char_incriment = 0;
+    char current;
+    bool result_still_possible = false;
+
+    for (char_incriment = 0; char_incriment < 6; char_incriment++)
+    {
+        // Grab out next character in the string
+        current = *(str + char_incriment);
+
+        for (num_idx = 0; num_idx < 10; num_idx++)
+        {
+            if (!possible_nums[num_idx]) continue;
+
+            // If we have passed the end of our number string and every character has matched,
+            // then we return our valid character.
+            if (char_incriment == num_string_lens[num_idx] && possible_nums[num_idx]) return (num_idx + '0');
+
+            // If the character is not the letter it should be, disqualify this number.
+            // e.g. if num_idx == 1 and char_incriment == 2, current should equal 'e'
+            // because 'e' is the 3rd number in the word 'one.'
+            if (current != num_strings[num_idx][char_incriment]) possible_nums[num_idx] = false;
+            else result_still_possible = true;
+        }
+        if (!result_still_possible) return 0;
+    }
+
+    return 0;
+}
+
+// Returns a string of the next line.
+// Remember to free() this after you're finished.
+// Limited by MAX_LINE_LEN (I'm lazy.)
+char *next_line(FILE *file)
+{
+    char *strbuf = malloc(sizeof(char) * MAX_LINE_LEN);
+    uint8_t idx = 0;
+    char current = 0;
+
+    while (current != '\n' && current != EOF)
+    {
+        current = fgetc(file);
+        strbuf[idx] = current;
+        idx++;
+    }
+
+    return strbuf;
+}
+
+int main(int argc, char **argv) {
+
+    // Get filename as an argument
+    char *path = (argc > 1) ? argv[1] : DEFAULT_FILE;
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    int8_t firstdigit = -1;
+    int8_t lastdigit = -1;
+    int8_t parsed_num = -1;
+    uint32_t sum = 0;
+    char current = 0;
+    char *strbuf = next_line(file);
+    uint8_t strbuf_idx = 0;
+
+    while (current != EOF)
+    {
+        parsed_num = parse_num(strbuf + strbuf_idx);
+        current = strbuf[strbuf_idx++];
+
+        if (current == '\n')
+        {
+            if (lastdigit == -1) lastdigit = firstdigit;
+            sum += (firstdigit * 10) + lastdigit;
+            firstdigit = -1;
+            lastdigit = -1;
+            strbuf_idx = 0;
+            free(strbuf);
+            strbuf = next_line(file);
+            continue;
+        }
+
+        if (parsed_num != 0) current = parsed_num;
+
+        if (current < '0' || current > '9') continue;
+
+        if (firstdigit == -1)
+        {
+            firstdigit = current - '0';
+        }
+        else
+        {
+            lastdigit = current - '0';
+        }
+    }
+
+    printf("Sum: %d\n", sum);
+
+    return 0;
+}

01/01.c

@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+int main(int argc, char **argv) {
+
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : "input.txt";
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    int8_t firstdigit = -1;
+    int8_t lastdigit = -1;
+    uint32_t sum = 0;
+    char current = 0;
+
+    while (current != EOF)
+    {
+        current = fgetc(file);
+
+        if (current == '\n')
+        {
+            if (lastdigit == -1) lastdigit = firstdigit;
+            sum += (firstdigit * 10) + lastdigit;
+            firstdigit = -1;
+            lastdigit = -1;
+            continue;
+        }
+
+        if (current < '0' || current > '9') continue;
+
+        if (firstdigit == -1)
+        {
+            firstdigit = current - '0';
+        }
+        else
+        {
+            lastdigit = current - '0';
+        }
+    }
+
+    printf("Sum: %d\n", sum);
+
+    return 0;
+}

01/01test.c

@@ -0,0 +1,60 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+// Returns -1 if a string is not a number (e.g. 'two')
+// Otherwise, returns the number.
+// Only works for single digits.
+// Only accepts lower case.
+int8_t parse_num(char *str)
+{
+    const char *num_strings[10] =  { "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine" };
+
+    // The lengths of the strings above, 
+    const uint8_t num_string_lens[10] =  { 4, 3, 3, 5, 4, 4, 3, 5, 5, 4 };
+
+    bool possible_nums[10] = { [0 ... 9] = true };
+    uint8_t num_idx = 0;
+    uint8_t char_incriment = 0;
+    char current;
+    bool result_still_possible = false;
+
+    for (char_incriment = 0; char_incriment < 6; char_incriment++)
+    {
+        // Grab out next character in the string
+        current = *(str + char_incriment);
+
+        for (num_idx = 0; num_idx < 10; num_idx++)
+        {
+            if (!possible_nums[num_idx]) continue;
+
+            // If we have passed the end of our number string and every character has matched,
+            // then we return our valid character.
+            if (char_incriment == num_string_lens[num_idx] && possible_nums[num_idx]) return num_idx;
+
+            // If the character is not the letter it should be, disqualify this number.
+            // e.g. if num_idx == 1 and char_incriment == 2, current should equal 'e'
+            // because 'e' is the 3rd number in the word 'one.'
+            if (current != num_strings[num_idx][char_incriment]) possible_nums[num_idx] = false;
+            else result_still_possible = true;
+        }
+        if (!result_still_possible) return -1;
+    }
+
+    return -1;
+}
+
+int main(int argc, char **argv) {
+
+    const char *num_strings[10] =  { "zerorr", "oneqw", "twoqw", "threere", "fourer", "fiveer", "sixer", "sevener", "eighter", "nineer" };
+
+    uint8_t i = 0;
+
+    for (i = 0; i < 10; i++)
+    {
+        printf("%d\n", parse_num(num_strings[i]));
+    }
+
+    return 0;
+}

01/input.txt

@@ -0,0 +1,1000 @@
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+95btwo
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+jjgjbqgbnz4gdsqk66991
+ninezckbpsr9
+jb5sevenseven
+one5nfdcvx
+1kbcmclhrh1onejzft
+fiveninefivedglztnjxblonehfive3
+6onesixh6onethree9
+spdzhnt5tpzrkh1fxlnine4skgzdln
+1onenineqgzcq2eightwonh
+vfzvds826vtlrcg6rvseven
+vqmoneight9tknqtcsmb
+kqrcrqrqjbdeight7ckhr23
+oneeight2
+8eightnhtqcggtxc6dfsfcjfpznmsthree
+sxfvfdkff8dvlmbdktsixmzpnxzmml2
+9lgmxktj1frxl

01/input2.txt

@@ -0,0 +1,4 @@
+zero1
+1zero
+asdfone
+asdfoneasdfoneasdf

02/02-part2.c

@@ -0,0 +1,126 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#define STRBUF_SIZE 200
+
+enum color
+{
+    color_red = 0,
+    color_green,
+    color_blue
+};
+
+typedef struct gameresult_t
+{
+    uint8_t red;
+    uint8_t green;
+    uint8_t blue;
+} gameresult;
+
+gameresult parse_hand(char *str)
+{
+    gameresult result = {0};
+    uint8_t num = 0;
+
+    while (true)
+    {
+        num = 0;
+        while (*str != ' ')
+        {
+            num = (num * 10) + (*str - '0');
+            str++;
+        }
+
+        str++;
+
+        switch(*str)
+        {
+            case 'r':
+                result.red += num;
+                str += 3;
+                break;
+            case 'g':
+                result.green += num;
+                str += 5;
+                break;
+            case 'b':
+                result.blue += num;
+                str += 4;
+                break;
+        }
+
+        if (*str != ',') return result;
+
+        str += 2;
+    }
+}
+
+gameresult parse_game_maxes(char *str)
+{
+    // Keeps track of the most cubes of a single color seen any hand
+    gameresult maxes = {0};
+
+    // Keeps result from the most recent hand
+    gameresult result = {0};
+
+    while (*str != ':') str++;
+    
+    while (*str == ':' || *str == ';')
+    {
+        str += 2;
+        result = parse_hand(str);
+        if (result.red > maxes.red) maxes.red = result.red;
+        if (result.green > maxes.green) maxes.green = result.green;
+        if (result.blue > maxes.blue) maxes.blue = result.blue;
+        while (*str != ';' && *str != '\n') str++;
+    }
+
+    return maxes;
+}
+
+bool game_is_valid(char *str)
+{
+    gameresult maxes = {0};
+
+    maxes = parse_game_maxes(str);
+
+    return (maxes.red <= 12 && maxes.green <= 13 && maxes.blue <= 14);
+}
+
+int main(int argc, char **argv)
+{
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : "input.txt";
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    char strbuf[STRBUF_SIZE] = {0};
+    gameresult maxes = {0};
+    uint8_t gamenum = 1;
+    uint32_t power = 0;
+    uint32_t sum = 0;
+
+    while (fgets(strbuf, 200, file))
+    {
+        maxes = parse_game_maxes(strbuf);
+        power = maxes.red  * maxes.green * maxes.blue;
+        sum += power;
+    }
+
+    printf("Sum: %d\n", sum);
+
+    return 0;
+}

02/02.c

@@ -0,0 +1,124 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#define STRBUF_SIZE 200
+
+enum color
+{
+    color_red = 0,
+    color_green,
+    color_blue
+};
+
+typedef struct gameresult_t
+{
+    uint8_t red;
+    uint8_t green;
+    uint8_t blue;
+} gameresult;
+
+gameresult parse_hand(char *str)
+{
+    gameresult result = {0};
+    uint8_t num = 0;
+
+    while (true)
+    {
+        num = 0;
+        while (*str != ' ')
+        {
+            num = (num * 10) + (*str - '0');
+            str++;
+        }
+
+        str++;
+
+        switch(*str)
+        {
+            case 'r':
+                result.red += num;
+                str += 3;
+                break;
+            case 'g':
+                result.green += num;
+                str += 5;
+                break;
+            case 'b':
+                result.blue += num;
+                str += 4;
+                break;
+        }
+
+        if (*str != ',') return result;
+
+        str += 2;
+    }
+}
+
+gameresult parse_game_maxes(char *str)
+{
+    // Keeps track of the most cubes of a single color seen any hand
+    gameresult maxes = {0};
+
+    // Keeps result from the most recent hand
+    gameresult result = {0};
+
+    while (*str != ':') str++;
+    
+    while (*str == ':' || *str == ';')
+    {
+        str += 2;
+        result = parse_hand(str);
+        if (result.red > maxes.red) maxes.red = result.red;
+        if (result.green > maxes.green) maxes.green = result.green;
+        if (result.blue > maxes.blue) maxes.blue = result.blue;
+        while (*str != ';' && *str != '\n') str++;
+    }
+
+    return maxes;
+}
+
+bool game_is_valid(char *str)
+{
+    gameresult maxes = {0};
+
+    maxes = parse_game_maxes(str);
+
+    return (maxes.red <= 12 && maxes.green <= 13 && maxes.blue <= 14);
+}
+
+int main(int argc, char **argv)
+{
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : "input.txt";
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    char strbuf[STRBUF_SIZE] = {0};
+    uint8_t gamenum = 1;
+    uint32_t sum = 0;
+
+    while (fgets(strbuf, 200, file))
+    {
+        if (game_is_valid(strbuf))
+            sum += gamenum;
+        gamenum++;
+    }
+
+    printf("Sum: %d\n", sum);
+
+    return 0;
+}

02/input.txt

@@ -0,0 +1,100 @@
+Game 1: 7 blue, 9 red, 1 green; 8 green; 10 green, 5 blue, 3 red; 11 blue, 5 red, 1 green
+Game 2: 7 green, 3 blue; 20 blue, 4 green; 6 red, 13 blue, 2 green
+Game 3: 11 blue, 3 red, 1 green; 15 red, 9 blue, 3 green; 11 blue, 4 red, 4 green; 1 red, 2 green, 14 blue; 18 blue, 4 green, 10 red
+Game 4: 3 red, 7 blue; 3 blue, 2 red, 2 green; 2 green, 1 red, 1 blue; 3 green, 5 blue, 5 red; 7 blue, 1 green, 1 red; 2 green, 7 blue
+Game 5: 1 blue, 2 red, 1 green; 6 blue, 3 green, 2 red; 2 blue
+Game 6: 5 green, 5 red, 5 blue; 9 blue, 6 green, 8 red; 7 green, 3 red, 15 blue; 9 blue, 9 green; 10 red, 12 blue, 4 green; 9 blue, 1 red, 9 green
+Game 7: 8 blue, 9 green, 16 red; 9 green, 9 blue; 10 red, 5 blue, 8 green; 9 green, 17 red, 2 blue; 1 blue, 18 red, 8 green; 3 green, 8 blue, 14 red
+Game 8: 6 green, 8 blue, 16 red; 10 green, 1 blue, 4 red; 2 blue, 15 red, 10 green; 7 green, 9 red, 2 blue; 17 red, 4 green, 7 blue
+Game 9: 5 blue, 1 green, 4 red; 2 green, 6 red, 12 blue; 2 green, 7 blue, 1 red; 12 blue, 2 green, 1 red
+Game 10: 1 red, 16 blue, 18 green; 14 green, 13 blue; 4 green, 7 blue; 5 red, 16 blue, 11 green; 14 green, 2 red, 5 blue; 10 blue, 3 red, 6 green
+Game 11: 4 green, 2 blue, 17 red; 1 green, 2 red, 1 blue; 5 blue, 14 red
+Game 12: 7 red, 7 green; 7 blue, 7 green, 8 red; 14 red, 7 blue, 5 green
+Game 13: 1 red, 7 green; 7 green, 5 blue; 4 blue, 1 red; 14 green, 5 blue, 2 red; 3 red, 5 green; 10 green, 2 blue, 3 red
+Game 14: 4 blue, 7 red; 10 red, 6 blue; 1 green, 3 red; 1 green, 12 blue, 8 red; 1 red, 1 green, 6 blue; 1 green, 6 red
+Game 15: 4 green, 6 blue, 12 red; 7 blue, 6 red, 4 green; 1 green; 16 blue, 5 red, 5 green; 11 blue, 7 red, 2 green
+Game 16: 6 blue, 2 red, 4 green; 7 green, 2 blue; 2 red, 4 green; 3 green, 4 blue, 1 red
+Game 17: 9 green, 9 red, 3 blue; 9 green, 4 blue, 5 red; 10 green, 2 blue, 3 red
+Game 18: 2 red, 1 green; 3 red, 9 blue, 1 green; 4 red, 10 blue; 6 blue, 2 green, 5 red; 12 blue, 5 red, 2 green
+Game 19: 2 blue, 15 green, 9 red; 9 blue, 15 red, 4 green; 9 green, 4 blue, 4 red; 2 blue, 12 green, 16 red
+Game 20: 5 blue, 2 green, 9 red; 10 blue, 2 green, 6 red; 1 red, 13 green, 6 blue; 15 green, 13 blue, 12 red; 13 blue, 5 green
+Game 21: 3 red, 1 green, 10 blue; 8 green, 10 blue, 5 red; 12 blue, 5 red, 2 green
+Game 22: 4 blue, 6 red, 2 green; 5 blue, 16 red; 13 red; 19 red, 1 green, 6 blue; 11 red, 2 green, 5 blue
+Game 23: 5 red, 4 green, 2 blue; 7 blue, 3 green; 5 blue, 4 red, 1 green; 2 blue, 3 red, 2 green
+Game 24: 1 green; 4 red, 6 green, 2 blue; 6 green, 4 red; 8 blue, 3 red, 2 green; 1 blue, 2 red
+Game 25: 4 green, 2 blue, 12 red; 10 blue, 1 red, 2 green; 3 green, 12 blue; 7 green, 12 red, 3 blue; 2 green, 6 blue, 13 red; 3 green, 14 red, 9 blue
+Game 26: 8 red, 8 blue, 4 green; 5 red, 14 blue, 11 green; 3 green, 4 blue; 3 red, 10 green, 8 blue
+Game 27: 14 red, 5 blue, 6 green; 1 red, 1 green; 3 red, 1 blue, 4 green
+Game 28: 11 green, 9 blue; 3 green, 6 blue, 7 red; 9 blue, 5 red, 10 green; 8 red, 5 blue, 10 green; 10 green, 9 red, 2 blue
+Game 29: 12 red, 1 green, 7 blue; 4 red, 4 blue; 12 red, 1 blue
+Game 30: 3 red, 9 blue; 7 blue, 3 green, 2 red; 1 green, 3 blue, 8 red; 15 blue, 8 red, 1 green; 1 red, 2 green, 6 blue; 2 blue, 3 green, 15 red
+Game 31: 10 red, 14 green, 9 blue; 6 blue, 7 red; 16 red, 3 blue, 5 green; 11 red, 7 blue, 1 green; 10 green, 8 red, 3 blue; 14 green, 6 red, 8 blue
+Game 32: 1 red, 7 blue, 4 green; 5 green, 6 blue; 4 blue, 2 green; 2 blue, 3 green
+Game 33: 2 red, 4 green; 1 green, 12 blue; 1 red, 4 green, 13 blue; 3 red, 11 blue; 8 blue, 3 red, 4 green; 4 green, 2 blue, 3 red
+Game 34: 9 green, 3 red, 10 blue; 2 red, 5 green, 7 blue; 8 green, 3 red
+Game 35: 3 blue, 1 red; 1 red, 1 green, 3 blue; 13 red, 1 blue; 3 blue, 3 green, 14 red; 1 blue; 3 blue, 2 green, 3 red
+Game 36: 5 red, 10 blue; 10 green, 4 red, 8 blue; 6 blue, 9 green, 9 red
+Game 37: 1 red, 3 green, 1 blue; 7 blue, 4 red; 11 red, 6 blue, 2 green; 1 green, 10 red, 3 blue; 2 blue, 1 green, 10 red; 10 red, 4 blue
+Game 38: 13 red, 6 blue, 1 green; 8 red, 4 green, 8 blue; 13 green, 7 red, 3 blue; 6 red, 12 green, 2 blue; 7 blue, 15 green, 5 red; 13 green, 2 blue, 11 red
+Game 39: 1 blue, 5 green, 6 red; 1 green, 8 red, 4 blue; 8 red, 10 green, 6 blue; 2 blue, 1 red, 4 green; 3 blue, 2 red, 7 green; 8 red, 6 green, 2 blue
+Game 40: 6 blue, 20 green, 12 red; 7 blue, 10 red, 7 green; 5 red, 2 green, 8 blue; 2 blue, 1 red, 7 green; 11 green, 3 red; 9 red, 9 blue, 6 green
+Game 41: 15 red, 5 green, 7 blue; 4 red, 7 blue; 12 green, 7 blue; 12 red, 15 green, 8 blue
+Game 42: 2 green, 12 blue, 4 red; 2 blue, 2 red, 8 green; 10 blue, 2 red, 11 green; 1 green, 1 red, 5 blue
+Game 43: 14 blue, 2 green, 11 red; 10 red, 8 blue; 15 blue; 1 green, 16 blue, 6 red; 3 red, 17 blue; 3 blue, 1 green
+Game 44: 3 blue, 4 green, 9 red; 7 green, 15 red, 2 blue; 8 green, 8 red; 3 green, 10 blue, 6 red
+Game 45: 2 green, 14 red; 1 blue, 16 red, 5 green; 3 green, 5 red; 1 blue, 5 green, 2 red
+Game 46: 2 red, 13 blue, 6 green; 8 green, 1 blue; 8 blue, 6 green, 2 red; 6 green, 3 blue; 2 green, 7 blue
+Game 47: 1 green, 11 blue, 6 red; 3 green, 4 blue, 4 red; 6 red, 13 blue; 6 blue, 5 green, 6 red
+Game 48: 1 red, 1 green; 6 red, 3 blue, 2 green; 3 green, 6 red
+Game 49: 10 blue, 15 green, 5 red; 5 green, 10 red; 4 green, 12 red, 5 blue; 7 red, 9 green, 7 blue; 17 green, 3 blue, 4 red
+Game 50: 7 red, 8 green; 11 red, 1 green, 2 blue; 12 red, 4 green; 15 red, 2 green; 5 red, 2 blue, 6 green; 1 green, 3 red
+Game 51: 7 red, 4 blue, 1 green; 10 red, 7 blue; 11 blue, 8 red
+Game 52: 3 green, 2 blue, 1 red; 1 red, 1 blue, 2 green; 3 green, 12 blue; 9 blue, 3 red; 6 blue, 2 red, 2 green; 1 green, 1 red, 14 blue
+Game 53: 7 red, 1 green, 4 blue; 5 blue, 5 red; 7 red, 2 blue
+Game 54: 3 red, 8 green, 12 blue; 15 red, 4 green, 16 blue; 1 blue, 4 green, 5 red; 5 green, 8 red, 10 blue; 14 red, 7 blue
+Game 55: 8 green, 18 blue, 2 red; 4 red, 15 green, 19 blue; 10 blue, 8 red, 1 green
+Game 56: 13 blue, 2 red, 5 green; 1 blue, 13 green, 5 red; 3 red, 1 blue, 10 green; 5 red, 14 blue, 1 green; 11 green, 6 blue, 6 red; 11 green, 7 blue, 8 red
+Game 57: 1 green; 1 blue; 1 blue, 6 red, 1 green; 1 green, 3 red; 1 green, 6 red
+Game 58: 14 blue, 7 red; 4 green, 10 red; 5 blue, 7 green, 6 red; 3 green, 6 red, 19 blue
+Game 59: 3 green, 5 red, 3 blue; 1 blue, 5 green, 3 red; 3 blue, 7 red, 4 green
+Game 60: 6 blue; 11 blue, 2 red, 6 green; 1 red, 3 blue; 2 green, 1 blue, 2 red
+Game 61: 5 red, 6 green, 8 blue; 8 blue, 5 green, 7 red; 6 green, 3 red, 7 blue; 8 green, 7 blue
+Game 62: 9 green; 4 red, 5 green; 3 green, 14 blue; 4 green, 3 red, 6 blue
+Game 63: 6 green, 12 blue; 1 red, 12 blue; 1 green, 13 blue; 3 blue, 8 green; 7 blue, 2 green
+Game 64: 2 green, 11 red, 1 blue; 2 red; 3 green; 2 green, 6 red; 1 blue, 6 red
+Game 65: 9 green, 1 blue; 5 green, 14 red, 1 blue; 11 green, 6 blue, 2 red; 8 red, 1 green; 9 green, 11 red, 5 blue; 18 green, 11 red, 1 blue
+Game 66: 5 green, 17 red; 1 blue, 4 green, 2 red; 3 green, 2 blue, 13 red; 4 red, 1 green; 2 green, 18 red; 18 red, 1 green, 2 blue
+Game 67: 7 green; 2 blue, 1 green; 1 blue, 6 green, 1 red; 3 green, 3 blue
+Game 68: 7 blue, 18 red, 16 green; 7 blue, 6 red, 3 green; 5 blue, 4 red; 12 red, 20 green, 7 blue; 5 green, 4 blue
+Game 69: 5 red, 19 green, 2 blue; 12 green, 7 red; 7 red, 10 green; 2 blue, 1 red, 1 green
+Game 70: 8 red, 2 green, 14 blue; 1 green, 12 red, 3 blue; 2 green, 1 blue, 18 red; 10 red, 15 blue, 1 green; 2 green, 1 red, 14 blue; 1 green, 12 blue, 8 red
+Game 71: 11 green, 9 red; 17 red, 1 blue, 9 green; 14 green, 1 red, 1 blue; 6 green, 11 red; 3 red, 14 green; 1 blue, 12 green
+Game 72: 4 red, 3 blue, 16 green; 12 green, 5 red, 4 blue; 7 red, 4 blue, 12 green
+Game 73: 1 blue; 1 green, 10 blue, 1 red; 1 blue, 1 red, 1 green; 11 blue, 1 green, 1 red; 10 blue
+Game 74: 12 red, 3 green; 11 red, 1 blue; 19 red, 1 blue; 3 green, 1 blue; 5 red, 1 blue; 5 red, 1 blue, 2 green
+Game 75: 9 blue, 4 green; 1 green, 1 blue, 5 red; 6 blue, 8 red, 3 green; 10 blue, 2 green, 6 red; 3 green, 3 red, 3 blue; 4 green, 7 red, 8 blue
+Game 76: 1 green, 13 blue, 2 red; 1 green, 15 blue; 8 red, 1 green, 10 blue; 3 blue, 6 red
+Game 77: 9 red, 2 green, 11 blue; 6 red, 5 blue, 2 green; 6 blue, 9 red, 1 green; 4 blue, 5 red; 13 blue
+Game 78: 13 blue, 4 red, 2 green; 7 red, 2 green, 8 blue; 6 red, 20 blue, 4 green; 7 red, 3 green, 14 blue; 15 blue, 2 red, 3 green
+Game 79: 2 red, 10 blue, 6 green; 4 blue, 3 red, 3 green; 3 red, 5 blue, 3 green; 1 blue, 4 green, 1 red; 1 red, 3 green, 1 blue; 1 blue, 6 green
+Game 80: 2 green, 1 blue, 3 red; 2 green, 2 red; 1 green, 4 red, 1 blue; 4 red, 3 green
+Game 81: 1 red, 3 green; 11 green; 4 green, 6 red; 1 red, 1 blue, 13 green; 11 green, 1 blue
+Game 82: 15 green, 3 red, 9 blue; 3 blue, 7 green, 3 red; 3 blue, 11 green; 9 blue, 3 red, 9 green; 5 blue, 1 green, 1 red; 4 blue, 9 green, 1 red
+Game 83: 5 red, 1 blue; 17 red, 1 green, 6 blue; 3 blue, 11 red; 7 blue, 4 red; 1 blue, 12 red, 1 green; 1 red, 1 green, 1 blue
+Game 84: 6 red, 7 green, 3 blue; 2 blue, 7 red, 15 green; 1 blue, 5 red, 3 green; 10 red, 1 blue, 4 green; 4 green, 2 blue, 4 red; 9 red, 11 green
+Game 85: 1 green, 10 red; 10 red, 2 blue, 3 green; 2 blue, 6 red; 1 blue, 16 red; 8 red, 2 green; 13 red, 4 green
+Game 86: 3 blue, 2 red, 9 green; 2 green, 6 red, 8 blue; 2 red, 7 blue, 8 green
+Game 87: 14 red, 1 green, 2 blue; 9 blue, 11 green, 7 red; 13 green, 5 blue, 1 red; 12 red, 7 blue, 3 green; 6 red, 8 blue, 3 green
+Game 88: 7 blue, 2 green, 14 red; 7 red, 4 green, 16 blue; 6 green, 6 blue, 2 red; 1 red, 7 green, 2 blue
+Game 89: 3 red, 5 blue, 3 green; 4 blue, 2 green, 14 red; 17 red, 1 blue
+Game 90: 9 red, 1 blue; 7 red; 12 red, 1 green, 1 blue
+Game 91: 12 green, 16 blue, 5 red; 18 green, 11 blue, 3 red; 5 green, 6 blue, 2 red; 13 blue, 10 green; 3 red, 2 blue
+Game 92: 7 red, 10 green, 13 blue; 4 green, 9 blue, 1 red; 3 green, 9 red, 13 blue
+Game 93: 2 blue, 2 red, 6 green; 3 red, 14 green; 13 green, 3 red, 3 blue; 3 red, 8 green; 13 green; 13 green, 1 red, 2 blue
+Game 94: 12 red, 5 green, 2 blue; 5 blue, 12 red; 5 blue, 2 red, 9 green; 10 red, 8 green, 8 blue; 7 red, 8 green; 3 blue, 6 green, 5 red
+Game 95: 7 green, 5 red, 3 blue; 14 green, 3 red, 5 blue; 6 green, 1 blue; 10 green, 2 red, 5 blue; 4 blue, 14 green, 4 red
+Game 96: 2 green, 2 blue, 2 red; 5 blue, 2 red; 2 blue, 1 green; 1 green, 1 red
+Game 97: 5 green, 6 red; 6 red, 5 green; 4 red, 4 blue; 1 blue, 4 green, 3 red; 1 green, 8 red; 2 red, 9 green, 5 blue
+Game 98: 1 red, 3 blue; 3 green; 1 red, 4 green; 1 red, 4 blue, 3 green; 2 blue, 4 green, 1 red
+Game 99: 8 blue, 3 green; 1 green, 3 red; 2 green, 5 blue, 7 red; 5 red, 9 blue, 1 green; 3 green, 6 red, 7 blue; 3 green, 6 blue, 9 red
+Game 100: 13 green, 9 blue, 4 red; 2 green, 2 red, 15 blue; 1 red, 1 green; 9 green, 1 red

02/input2.txt

@@ -0,0 +1,3 @@
+Game 1: 7 blue, 9 red, 1 green; 8 green; 10 green, 5 blue, 3 red; 11 blue, 5 red, 1 green
+Game 2: 7 green, 3 blue; 20 blue, 4 green; 6 red, 13 blue, 2 green
+Game 3: 11 blue, 3 red, 1 green; 15 red, 9 blue, 3 green; 11 blue, 4 red, 4 green; 1 red, 2 green, 14 blue; 18 blue, 4 green, 10 red

03/03-part2.c

@@ -0,0 +1,158 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define STRBUF_SIZE     200
+#define DEFAULT_FILE    "input.txt"
+#define ISDIGIT(X)      (X >= '0' && X <= '9')
+
+// Parses a found number.
+// The provided location can be any digit of the
+// number; this function will automatically
+// seek the first digit before processing.
+// Erases numbers as they are processed.
+uint16_t parse_num_at(char *str, uint8_t idx)
+{
+
+    // Check input
+    if (str[idx] < '0' || str[idx] > '9') return 0;
+
+    // Find first digit of number
+    while (ISDIGIT(str[idx]) && idx) idx--;
+    if (!ISDIGIT(str[idx])) idx++;
+
+    uint16_t num = 0;
+
+    // Add up all digits
+    while (ISDIGIT(str[idx]))
+    {
+        num = (num * 10) + (str[idx] - '0');
+        // Erase the number to make sure we don't count it twice
+        str[idx] = '.';
+        idx++;
+    }
+
+    return num;
+}
+
+// If the character is a * with two adjacent numbers,
+// returns the gear ratio. Returns zero if the symbol
+// is not a gear.
+uint64_t get_gear_ratio( uint8_t idx,
+                                char *above,
+                                char *current,
+                                char *below)
+{
+    char *above_copy =   malloc(sizeof(char) * STRBUF_SIZE);
+    char *current_copy = malloc(sizeof(char) * STRBUF_SIZE);
+    char *below_copy =   malloc(sizeof(char) * STRBUF_SIZE);
+
+    memcpy(above_copy, above, STRBUF_SIZE);
+    memcpy(current_copy, current, STRBUF_SIZE);
+    memcpy(below_copy, below, STRBUF_SIZE);
+
+    uint16_t nums[8] = {0};
+
+    if (idx) nums[0] = parse_num_at(above_copy, idx - 1);
+    nums[1] = parse_num_at(above_copy, idx);
+    nums[2] = parse_num_at(above_copy, idx + 1);
+
+    nums[3] = parse_num_at(current_copy, idx + 1);
+    nums[4] = parse_num_at(current_copy, idx - 1);
+
+    if (idx) nums[5] = parse_num_at(below_copy, idx - 1);
+    nums[6] = parse_num_at(below_copy, idx);
+    nums[7] = parse_num_at(below_copy, idx + 1);
+
+    free(above_copy);
+    free(current_copy);
+    free(below_copy);
+
+    uint8_t i = 0;
+    uint16_t num1 = 0;
+    uint16_t num2 = 0;
+
+    for (i = 0; i < 8; i++)
+    {
+        // More than 2 adjacent numbers
+        if (nums[i] && num1 && num2) return 0;
+
+        // The second number
+        if (nums[i] && num1) num2 = nums[i];
+
+        // The first number
+        else if (nums[i]) num1 = nums[i];
+    }
+
+    return num1 * num2;
+}
+
+// Search through a line of *current for symbols.
+uint64_t parse_line(char *above, char *current, char *below)
+{
+    uint64_t sum = 0;
+    uint8_t idx;
+    char c;
+
+    for (idx = 0; current[idx] != 0; idx++)
+    {
+        c = current[idx];
+        if (c == '*')
+        {
+            // We've found a symbol,
+            // add up all numbers around it
+            sum += get_gear_ratio(idx, above, current, below);
+        }
+    }
+    
+    return sum;
+}
+
+int main(int argc, char **argv)
+{
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : DEFAULT_FILE;
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    char *above =   malloc(sizeof(char) * STRBUF_SIZE);
+    char *current = malloc(sizeof(char) * STRBUF_SIZE);
+    char *below =   malloc(sizeof(char) * STRBUF_SIZE);
+
+    memset(above, '.', STRBUF_SIZE);
+    fgets(current, STRBUF_SIZE, file);
+
+    uint64_t sum = 0;
+
+    while (fgets(below, 200, file))
+    {
+        sum += parse_line(above, current, below);
+
+        free(above);
+        above = current;
+        current = below;
+        below = malloc(sizeof(char) * STRBUF_SIZE);
+        memset(below, '.', STRBUF_SIZE);
+    }
+
+    // Process the last line of the file
+    sum += parse_line(above, current, below);
+
+    printf("Sum: %lud\n", sum);
+
+    return 0;
+}

03/03.c

@@ -0,0 +1,130 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define STRBUF_SIZE     200
+#define DEFAULT_FILE    "input.txt"
+#define ISDIGIT(X)      (X >= '0' && X <= '9')
+
+// Parses a found number.
+// The provided location can be any digit of the
+// number; this function will automatically
+// seek the first digit before processing.
+// Erases numbers as they are processed.
+uint16_t parse_num_at(char *str, uint8_t idx)
+{
+
+    // Check input
+    if (str[idx] < '0' || str[idx] > '9') return 0;
+
+    // Find first digit of number
+    while (ISDIGIT(str[idx]) && idx) idx--;
+    if (!ISDIGIT(str[idx])) idx++;
+
+    uint16_t num = 0;
+
+    // Add up all digits
+    while (ISDIGIT(str[idx]))
+    {
+        num = (num * 10) + (str[idx] - '0');
+        // Erase the number to make sure we don't count it twice
+        str[idx] = '.';
+        idx++;
+    }
+
+    return num;
+}
+
+// Returns the sum of all numbers around a symbol,
+// including diagonals.
+uint16_t search_numbers_around( uint8_t idx,
+                                char *above,
+                                char *current,
+                                char *below)
+{
+    uint16_t sum = 0;
+    if (idx) sum += parse_num_at(above, idx - 1);
+    sum += parse_num_at(above, idx);
+    sum += parse_num_at(above, idx + 1);
+
+    sum += parse_num_at(current, idx + 1);
+    sum += parse_num_at(current, idx - 1);
+
+    if (idx) sum += parse_num_at(below, idx - 1);
+    sum += parse_num_at(below, idx);
+    sum += parse_num_at(below, idx + 1);
+
+    return sum;
+}
+
+// Search through a line of *current for symbols.
+// returns the sum for that line (erases numbers as
+// they are processed.)
+uint16_t parse_line(char *above, char *current, char *below)
+{
+    uint16_t sum = 0;
+    uint8_t idx;
+    char c;
+
+    for (idx = 0; current[idx] != 0; idx++)
+    {
+        c = current[idx];
+        if (!ISDIGIT(c) && c != '.' && c != '\n')
+        {
+            // We've found a symbol,
+            // add up all numbers around it
+            sum += search_numbers_around(idx, above, current, below);
+        }
+    }
+    
+    return sum;
+}
+
+int main(int argc, char **argv)
+{
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : DEFAULT_FILE;
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    char *above =   malloc(sizeof(char) * STRBUF_SIZE);
+    char *current = malloc(sizeof(char) * STRBUF_SIZE);
+    char *below =   malloc(sizeof(char) * STRBUF_SIZE);
+
+    memset(above, '.', STRBUF_SIZE);
+    fgets(current, STRBUF_SIZE, file);
+
+    uint32_t sum = 0;
+
+    while (fgets(below, 200, file))
+    {
+        sum += parse_line(above, current, below);
+
+        free(above);
+        above = current;
+        current = below;
+        below = malloc(sizeof(char) * STRBUF_SIZE);
+        memset(below, '.', STRBUF_SIZE);
+    }
+
+    // Process the last line of the file
+    sum += parse_line(above, current, below);
+
+    printf("Sum: %d\n", sum);
+
+    return 0;
+}

03/input.txt

@@ -0,0 +1,140 @@
+.854...........................................................................362...........271...732........838.........24................
+...*.............................117*...........459........767*648....#.........*...................................$...&..=................
+....970.........368.124.+............57................653...........723.....366....*443..60.........536....441....45..879.....789...*......
+...........749*...-...+..330.....................215%...*................725.....953........%.................*............639......331.419.
+.......706.....59.............*....=...262.............678...........857.*............189....................912.+589.846*...*..............
+..........*................393.59..418....*................151...........594...........*....584*258.......................17.997............
+.......774....275........................777........841..............988.........121....908.........86.....482..295....................@....
+.110..........%.....605..@.......305*18...............*....740.............840..*................52*.......*...........100...........250....
+...........*..............856..............412.........761....*....344....*.....505.....................121......709...-....-...............
+......980.269..189+............701..............22...$........343..*...684..............-375......223........97.*..........890......443.....
+..904*..................555.....*.......38.....*....207............773.......................824.....*.......*..../....618..................
+....................355*........362....*......442.$..........613...........%770.......526.....*.......418.....283..76....*....862...........
+...450....*292..............735.....149...........143..........*...458...........279.........43..769...................$..48.....*..........
+....*..413.........983*....*.................679.......642....214...#........107*......=.........*.....%...........276.39......196.889*624..
+...128.................658.515...890#...................../...........................60..../....528..359.....451...*.....56................
+...................719...................525.................$502............284-........@...489.................#..287.....@....+..........
+...849...............*................../.........................282.+649...............217............240.....................833.....930.
+.......666...179.....986.526................./927......73.....176*...............@...459...........=946..*..488...126.....*.................
+..........@.....*549.....@...261.....370*951...........+.............114......170.......@...............269............471.891.$859.........
+.............................../.................646.....-.327........*..237..............452......../......*620..713...............324.....
+..................=716.....753....................-....431..=.......692.%.......210.......*.......860....208...............81*655....$......
+......298....17*..........+....................................................*..........603................950.218.$......................
+................692...54......+778.809........140..*.........249............%.332..............*.........372*......*.328.....=..............
+.......421.............#..............+........*....493.......*..........589..................286...............254..........458...672...258
+........*.....949.630.....725...609.........408.............108..............304.517......829.........666*..........724.182...........*.=...
+.........435./....*..........*.*................580..................@.........*..&..147.-......221*......544..662/....*...........881......
+..750.............561......568.487.@...935.......*....106...........104......808.......*............333...................&900..............
+...................................287.$......930.....&.....*528.........332............755..................840../.............583.....209.
+.371.299.................503.............................632................*.......&...................500........647..193.......-.........
+....*........-902..2.123..*...912.......775......./...............241........734....90.968.513..66.566...................*..&...............
+..................*....@.923...*.......*.....289..47.....785..710.......54................*......*....................767....452....=....597
+.............348.362............607.....889.....#........*....*........*......$904................694...............................241.....
+....955........*.....559*792............................307..25.........449..............*751.404.....134.....841...........................
+......&.959...300............446.504.644....692...............................#.................-.....*.......*...758*35....................
+.908$...*...........&..861...........=.....%....240............-..+..9.514...615.....&....-646.....538...144.751...........899.........545..
+.......806.270*....946.@...............*..........*.555@....803..322.-............410..........514.................510..10..*.....858..-....
+...............373....................7.918.....699.........................710.......&...........-.....78%............+....34..............
+....653...............................................553.......896.......-......&...721....970.............................................
+.......%...........379..377.....770@.................$.....126....*...712.287....951.........*......984*..........+.............+700........
+..............924...*....*.............422...................*...233.*........................124...........902....181......................
+................&....156..363.....*855....*.................884......509..879..755.......$...........*635......*........283.........661.....
+..559..........................393.........766...789.............683..................461..#......910.........904.........$.%......*.....13.
+.........=...568.........680/.......................*......*522.#..........................747...........*113................702...952......
+....*....334...*...392..........910*...............233..189.........219.879............225......521...941...................................
+.146.981......284.*.......*972......391.....789*...................................628*.....*....*................675.......................
+..................921..151......................983...............582......983.690.......213.137.268.............*..............24$.........
+....561....................600........106-...............226..................*.....996.............................681.....768.......852...
+..............................%............................$................=...963..$.....@............421*305.......*.....*........$......
+.....923.285*.....961...........*......$812......812..851.............678.29.......*......501.....228..............385...853...........251..
+.444*...............*...998...99.711.............+.....*......330.....*.........287...........781..+..........%445..........................
+......$....250=.....965...*.............................113...$......766....$.......941........-......658.............894........351........
+......335...............463.328*.....411....%.............................981.113......*5.............*...773=.573&....*............$.......
+..........%348..................460.....*5..517.......583.261.....889@.......................953.....496...............547............620...
+...299.................367.......................+....*................852.442.796.........*.@...............=................834.....*.....
+....*....772...487.......................#......938.462.956..41.643...*.....#.....*592....66...809.368..3..549........................772...
+.566........*.....*320.....498..775.230.193....................*......961.........................*....*.......%283.....406.......495.......
+........292..585..............*.*.....*..........213...*309...................469..549......413........903................*....29..*........
+.........*.......@.........551..806...489......................51.655.999*.......*.$.............21*.................300..931....*..595.....
+......878......62../...........................871......169..=..&..*......235..788...497..........................68....*.......191.........
+.144.........+.....31............-...............*..623*....428.....955...............*.............424....89....*......728.............*665
+.............447...............530...203...955.336..........................227........665.......$.........*.....669..............473.......
+835...................*323..............*./...........=.....24..........*.........................452.......9.............263.........570...
+......568...803@.....................152.......209.933.....*....877..667.895............548...963......................................*....
+.......$.........=............................*...........948..-...................171.*........*.605.765..-........90..............992.....
+..360..........#.476...........................564../.............755*...............+..709...11.....*......909..........696..124%..........
+........74...73................320.........658......739...=...........484...860*....................................314.....................
+...=509...*.........79.290........*...222...*.............46...940..............960.....473.....320..........$681......*591..269....../.....
+........887.94@......*..*.........302...+.784.554+............+......#......455........./............891..........457........*...609.120....
+....................874.246.....................................+.....228..*....&.........272....%..$.....*377.....*..52..604....%..........
+.....44.....870*457................905.45......58...............956.........935.551...807..$.....21....356.......317....................%...
+.........=...................267......*...300=.........543..............398..............#.................$.......................386...745
+..........145......+............................*......*...........7....$.............64...........646....675..1..930..770.....791.$........
+................744....462......443&......*389..575..965...805....+..14.......761*578..-...#..776...*..................-........-.......822.
+....668.484...............*............875.................*.........*....................227...*..908.............215......*.......270.....
+.......*......771..........318....883......881...........655.@26..130..799.......876..91......28...........699.........807...510............
+.............-........391*.........*.......+......903..................*.....379.*....@...........713........#............*.................
+..........+................196..230...........411....*965..682.......873....$.....916....755....&..=.....................296......+958.983..
+...*.....718.......279........%...............................*.271.............@.......*......932.......621..637.843..................*....
+..59..........%2...........................................400...*...142.870...746......256..........865*...........%...=.....%...409...761.
+............@...........122*157...........394........%.444.....207...-......*.........................................434..827...*..........
+.....266..19.....=..............624.......*........398....*................373...........418...16.....654.878*.................890..........
+...............487..........884....*......199.227........723......914*411...........228..........%...................872................-...
+.....937..608.................*....306........$....................................*..................522..309.@16.....*.............765....
+......#....................128../.................%136....140.................773...114...........33....*....*.........615.....303..........
+.249.....590..$...949..768.......380......%...996..............833...28...310.#...................*..338.....770...559......................
+...+.854.../.678..*....................646...*.........................=...&..............#.....422...................#.231...714.122.......
+......*...........552........................741..........+.......437........455*768..134..69..........*........519.......*........*........
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+219*...................................#.599...845.....*.....................$....*.........*...................$....996...240........*.....
+..........151.520...554.............................665..........................1.398.=450..426.....198.....326.....+..........-....129....
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+..........463.....776......804............*..............*.....*..........%....90/...834.790...514...740.770.......667......................
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+........*.......%...........596....=.*....................863................$................428..*......899.....................114.......
+.595=.112.737.699................382.888..........................315...@...325..........480........115..*.........-......368...............
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+...+........................$........+..967*.........*....921......321......%................612@....*......................44..............
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+..........................................*..392..&.........505...957.@.........158...285......881#....497.........+...*....................
+.........=../..../.....588........227....639............741*..........443..681..........+..153........................335...................
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+............................922......92...........180..........................&39...%....208..389......696.....*............=.......883.852
+....237.........950.........*............80..............................................*....................657.......................*...
+....../..611.......*.....671...443...971.&....366....381...442....458...$.......589.343.397.....463.......60.......&........125......&......
+..853...../..945..564...........*......*.......@......-................783..........*.......................*.......28......=.........373...
+................*.......+843..550..998.973.........+.....208.565..@..............231......292............+.365..172............+............
+......117......615..................*............299............&..862.895............/86...*....114..552........*...697.....733...388......
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+...141........*.....%......+......967........-...%...........243...*.......904............*....*..............88.377......619...............
+................=.....-668....%.....=.+461..525.....662.....*......196..28..............778...940..400..682...*...*.........*..638*.........
+779#..113........209...........744....................*...144..811....../...#......................-...*.....297..713.....50................
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+...*..290...573......*............437....227.....53......132............#....471%.............501..%..................733.....270.....=.....
+..637...*............596............................=....*.......400...............*...........*....................................#.......
+......958.....757%.........=.........228......624...746.81../.....*........../..718.198..38...184..............*820..774......./830.693.....
+.........................453...405.=...=....................100.144.......728...........*...................498............$................
+..616............................*.756...310.........#52.............130.......=........506.....509.779..........723.......182..+...........
+...*....49.....-..............551..........*................789./.....*......306...613........./......*..491....*...............791..931....
+...863.....%.72......832.653........*490....814.....984.....=...741...568..........*.................998........567........+........#.......
+.........171..........*..-.......406...............*....389.....................486.....630............../...............457.576............
+..............308..515..................373@......709..&..............*185..................689..........751........44..........*764........
+..............*..............661....=.........*.............993....984.....*.......908......=...273............../.*........................
+.......582..335...260....59......998../.....39.760.313*174...*..........@.183......................*47....&994.887.577........*464.....22...
+......*...............................449..................802........762.....522..139+..154..266$......................46.323.....712*.....
+....827.....................................35......600*29.....724........488............*...............149*227.........*..................
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+.......................125.......311............715........263...........................................173...................235....291...

03/input2.txt

@@ -0,0 +1,3 @@
+.854...........................................................................362...........271...732........838.........24................
+...*.............................117*...........459........767*648....#.........*...................................$...&..=................
+....970.........368.124.+............57................653...........723.....366....*443..60.........536....441....45..879.....789...*......

03/input3.txt

@@ -0,0 +1,10 @@
+467..114..
+...*......
+..35..633.
+......#...
+617*......
+.....+.58.
+..592.....
+......755.
+...$.*....
+.664.598..

04/04-part2.c

@@ -0,0 +1,117 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#define DEFAULT_FILE        "input.txt"
+#define STRBUF_LEN          200
+#define NUM_CARDS           202
+#define WINNING_NUM_SIZE    10
+#define HOLDING_NUM_SIZE    25
+#define ISDIGIT(X)      (X >= '0' && X <= '9')
+
+void parse_nums(char *str, uint8_t *nums, uint8_t len)
+{
+    uint8_t i = 0;
+    uint8_t digit_idx = 0;
+    char c;
+    uint8_t num = 0;
+
+    for (i = 0; i < len; i++)
+    {
+        num = 0;
+        digit_idx = (i * 3);
+        c = str[digit_idx];
+        if (ISDIGIT(c)) num = (c - '0') * 10;
+        num += str[digit_idx + 1] - '0';
+        nums[i] = num;
+    }
+}
+
+void parse_line(char *str, uint8_t *winning_nums, uint8_t *holding_nums)
+{
+    while (*str != ':') str++;
+    str += 2;
+    parse_nums(str, winning_nums, WINNING_NUM_SIZE);
+
+    while (*str != '|') str++;
+    str += 2;
+    parse_nums(str, holding_nums, HOLDING_NUM_SIZE);
+}
+
+bool num_in_set(uint8_t num, uint8_t *set, uint8_t len)
+{
+    uint8_t i = 0;
+    for (i = 0; i < len; i++)
+    {
+        if (num == set[i]) return true;
+    }
+
+    return false;
+}
+
+uint32_t calculate_points(uint8_t *winning_nums, uint8_t *holding_nums)
+{
+    uint32_t points = 0;
+    uint8_t i = 0;
+    for (i = 0; i < HOLDING_NUM_SIZE; i++)
+    {
+        if (num_in_set(holding_nums[i], winning_nums, WINNING_NUM_SIZE)) points++;
+    }
+
+    return points;
+}
+
+int main(int argc, char **argv)
+{
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : DEFAULT_FILE;
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    char strbuf[STRBUF_LEN] = {0};
+    uint8_t winning_nums[WINNING_NUM_SIZE] = {0};
+    uint8_t holding_nums[HOLDING_NUM_SIZE] = {0};
+    uint64_t points = 0;
+    uint64_t card_copies[NUM_CARDS] = { [0 ... NUM_CARDS-1] = 1 };
+    uint8_t i = 0;
+    uint8_t copyidx = 0;
+    uint8_t cardidx = 0;
+
+    for (cardidx = 0; cardidx < NUM_CARDS; cardidx++)
+    {
+        fgets(strbuf, STRBUF_LEN, file);
+        if (strbuf[0] == '\n') break;
+        parse_line(strbuf, winning_nums, holding_nums);
+        points = calculate_points(winning_nums, holding_nums);
+        for (i = 0; i < points; i++)
+        {
+            // Add copy of card for every point
+            if (cardidx + i < NUM_CARDS)
+                card_copies[cardidx + i + 1] = card_copies[cardidx + i + 1] + card_copies[cardidx];
+            else
+                break;
+        }
+    }
+
+    points = 0;
+    for (i = 0; i < NUM_CARDS; i++)
+    {
+        points += card_copies[i];
+    }
+
+    printf("Total cards: %d", points);
+
+    return 0;
+}

04/04.c

@@ -0,0 +1,100 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#define DEFAULT_FILE        "input.txt"
+#define STRBUF_LEN          200
+#define WINNING_NUM_SIZE    10
+#define HOLDING_NUM_SIZE    25
+#define ISDIGIT(X)      (X >= '0' && X <= '9')
+
+void parse_nums(char *str, uint8_t *nums, uint8_t len)
+{
+    uint8_t i = 0;
+    uint8_t digit_idx = 0;
+    char c;
+    uint8_t num = 0;
+
+    for (i = 0; i < len; i++)
+    {
+        num = 0;
+        digit_idx = (i * 3);
+        c = str[digit_idx];
+        if (ISDIGIT(c)) num = (c - '0') * 10;
+        num += str[digit_idx + 1] - '0';
+        nums[i] = num;
+    }
+}
+
+void parse_line(char *str, uint8_t *winning_nums, uint8_t *holding_nums)
+{
+    while (*str != ':') str++;
+    str += 2;
+    parse_nums(str, winning_nums, WINNING_NUM_SIZE);
+
+    while (*str != '|') str++;
+    str += 2;
+    parse_nums(str, holding_nums, HOLDING_NUM_SIZE);
+}
+
+bool num_in_set(uint8_t num, uint8_t *set, uint8_t len)
+{
+    uint8_t i = 0;
+    for (i = 0; i < len; i++)
+    {
+        if (num == set[i]) return true;
+    }
+
+    return false;
+}
+
+uint32_t calculate_points(uint8_t *winning_nums, uint8_t *holding_nums)
+{
+    uint32_t points = 0;
+    uint8_t i = 0;
+    for (i = 0; i < HOLDING_NUM_SIZE; i++)
+    {
+        if (num_in_set(holding_nums[i], winning_nums, WINNING_NUM_SIZE)) {
+            if (points) points = points * 2;
+            else points = 1;
+        }
+    }
+
+    return points;
+}
+
+int main(int argc, char **argv)
+{
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : DEFAULT_FILE;
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    char strbuf[STRBUF_LEN] = {0};
+    uint8_t winning_nums[WINNING_NUM_SIZE] = {0};
+    uint8_t holding_nums[HOLDING_NUM_SIZE] = {0};
+    uint32_t totalpoints = 0;
+
+    while (fgets(strbuf, STRBUF_LEN, file))
+    {
+        if (strbuf[0] == '\n') break;
+        parse_line(strbuf, winning_nums, holding_nums);
+        totalpoints += calculate_points(winning_nums, holding_nums);
+    }
+
+    printf("Total Points: %d\n", totalpoints);
+
+    return 0;
+}

04/input.txt

@@ -0,0 +1,202 @@
+Card   1: 74  8  2 86 40 25 93 17 61 32 | 65 25 73 55 75 94 54 99 53 17 89  4 44 13 15 32 57 92  8 21 74 64  5 87 24
+Card   2:  8 18 79 59 71 84 72 23 96 74 | 22 83 74 78 72 30  8 59  6 23  7 71 31 84 18 96 21 36 51 67 80 79 60 28 42
+Card   3: 63 27 56 19 85 86 40 78 67 54 | 34 32 79 64 35 46 61 31 24 41 33 44 10 56 49 36  4 82 98 54 23 21 63 86 51
+Card   4:  2 95 87 25 13 12  9 24 68 29 | 84 54 49 78 52 60 34 25 97 26 55 39 66 79 23 94 29 67 12 51  9 16 19 76  8
+Card   5: 70 92 50 61 43 16 53 71 91  7 | 17 70 62 84 82  9 14 16 56 15 63 91 77 57 58 60 96 35 88 26 51 54 59 74 80
+Card   6: 34 86 44 60 10  4 89  5 94 92 | 60 95 35  2 86 32 94 79 82 64  4  5 92 89 44 69 34 21 76 72  9  6 52 48 61
+Card   7: 99 36 57 20 46 38 26 58 72 11 | 99 70 20 58 38 67 76 36 84 27 94 11 26 35 46 21 81 31 72 62 13 10 57 54  4
+Card   8: 19 95 24 99 44 36 58 26 31  6 | 69 10 43 42 70 64 92 40 38 47 21 98 41 49 20 71 65 59 91 72 34 74 84 29 22
+Card   9: 87 77 90 73  7 27 48  1 13 55 | 96 28 40 62 19  3 25 47 80 85 68 94 82 50 12 65 84 75 83 41 91 89 55 42 48
+Card  10:  6 89 13 82 16 54 27 67 19 76 | 65 67 94 58 97 61 54 80 53  6 73 41 95  7 83  2 23 11 63 24 78 29 13 16 82
+Card  11: 27 50  4 17 31 70 18 75 91 20 | 71 85 67 80 92  6 31 48 15 70 51  7 78 34  8 72 16 62  4 52 75 39  2 82 74
+Card  12: 27 68 79 78 21 56 53 29  2 74 | 96 69 59 49 20 42 23 71 54 72 25  7 55 19 64 37 62 41 10 66 26 75 93 18 84
+Card  13:  1 75 85 51 47 45 93 11 57 80 | 97 66  4 61 42 36 12 83 86 51 99 90 52 82 30 33 20 56 44 59 18 24 28 40 41
+Card  14: 24 28 85 42  5  3 33 76 98 75 | 31 95 54  8 90 10  6 85 75 44 94 40 62 47 83 26  9 27 68 63 88 80 82 55 93
+Card  15: 52 28 90 27  6 37 44  3 51 39 | 65 44 64 85 47 20 86 83 38 49 80 21 56 30 89 69 84 93  1 48 88 76 36 77 97
+Card  16: 28  7  3 39 71 85 84 13 44 31 | 93 79 33 21  4 18 63 23 68 49 57  9 22 54 27 69 75 29 30 78 37 98 91 38 94
+Card  17: 97 20 84 50 98 82 45 22 33 60 | 53 10 68 92 43 76 99 52 38 96 31  4 25 15 11 42 69 56 62 23 29 74 51 39 40
+Card  18: 28 66 82 85 94 35 72 29 63 68 | 73 86 63 60 20 10 64 89 66 61 90 35 72  8 85 28 29  1 88 49 76 36 82 94 68
+Card  19: 58 41 33 29 38 60  3 73 10 13 | 52 73 20 51 47 75 74 26 69 18 70 24 62 53 91 85 63  1 76  5 42 43 97 10 84
+Card  20: 46  8 66  7 27  4  9 78 24 18 | 13 14 57 92  6 59  3 81 70 10  4 51 98 23 66 64 74 49 83 27 24 73 95 35  7
+Card  21: 15 32 12 47 53 89 24 58 59 18 | 47 82  1 53 58 93 44 19 12 96 13 61 15 72 75 83 65 41 54 49 71 78 68 59 79
+Card  22: 92 27 79 68 46 97  2 96 94 80 | 18 81 12 13 39 93 83 38 52 46 89 17 24 58 49 74 10  8 57 65 35 19 54 41 11
+Card  23: 92 72 68 65 54 18 34 62 41 82 | 96 32 74 10 12  8 34 55 54 83 91 22 47 68 52 21 41 65 72 97 30 70 46 18  9
+Card  24: 49 76 13 10 59 33 86 29 95 32 | 16 60 38 33 68 51 15 50 95 61 29 93 76  6 31 71 10 25 13 40 49 77  2 32 23
+Card  25: 38 66 33  7 77 73 44 50 25 76 | 20 12 63 92 61  5 88 37 75 21 41 47 73 77 13 76 31 80 60 34 93 90 54  3 45
+Card  26: 77 45 81 84 53 80 76 22 75 61 | 25 58 38 45 98 10  6 92 70 82 24 22  4 68 97 72 14 49 17 83 27 53 77 89 75
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+Card  28: 41 84 40 62 67 89 29  7  2  8 | 35  9 24 29 20 33  6 98 50 95 10 36 14 80  1  3 88 15 13 48 18 72 26 76 31
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04/input2.txt

@@ -0,0 +1,6 @@
+Card 1: 41 48 83 86 17 | 83 86  6 31 17  9 48 53
+Card 2: 13 32 20 16 61 | 61 30 68 82 17 32 24 19
+Card 3:  1 21 53 59 44 | 69 82 63 72 16 21 14  1
+Card 4: 41 92 73 84 69 | 59 84 76 51 58  5 54 83
+Card 5: 87 83 26 28 32 | 88 30 70 12 93 22 82 36
+Card 6: 31 18 13 56 72 | 74 77 10 23 35 67 36 11

boilerplate.c

@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+int main(int argc, char **argv)
+{
+    // Get filename as an argument, defaults to "input.txt"
+    char *path = (argc > 1) ? argv[1] : "input.txt";
+
+    if (!path)
+    {
+        printf("Requires input file.\n");
+        return 1;
+    }
+
+    FILE *file = fopen(path, "r");
+
+    if (!file)
+    {
+        printf("Could not find file.");
+        return 1;
+    }
+
+    // Code goes here
+
+    return 0;
+}