2023-02

include/advent_utility.h

@@ -5,6 +5,9 @@
 
 #define DEFAULT_DELIM " \t\n\r\f\v"
 
+#define MAX(x, y) (x) > (y) ? (x) : (y)
+#define MIN(x, y) (x) < (y) ? (x) : (y)
+
 char *md5_str(const char *);
 
 char *capture_system(const char *);

src/2023/02.c

@@ -1,10 +1,64 @@
 #include <stdio.h>
-#include <stdlib.h>
+#include <string.h>
 
 #include "lfinput.h"
+#include "advent_utility.h"
+
+struct Game {
+    int id;
+    int red_max;
+    int green_max;
+    int blue_max;
+};
+
+static void parse(char *input, struct Game *g) {
+    memset(g, 0, sizeof(struct Game));
+
+    sscanf(input, "Game %d:", &g->id);
+    const char *c = strchr(input, ':') + 1;
+    char cpy[1024];
+    strcpy(cpy, c);
+
+    char *token = strtok(cpy, ",;");
+    while (token != NULL) {
+        int count;
+        char color[10];
+        if (sscanf(token, "%d %9s", &count, color) == 2) {
+            if (strcmp(color, "red") == 0) {
+                g->red_max = MAX(count, g->red_max);
+            } else if (strcmp(color, "blue") == 0) {
+                g->blue_max = MAX(count, g->blue_max);
+            } else if (strcmp(color, "green") == 0) {
+                g->green_max = MAX(count, g->green_max);
+            }
+        }
+
+        token = strtok(NULL, ",;");
+    }
+}
+
+#define RED 12
+#define GREEN 13
+#define BLUE 14
+
+static int valid(struct Game *g) {
+    return g->green_max <= GREEN && g->red_max <= RED && g->blue_max <= BLUE;
+}
 
 void advent2023day02(void) {
-    char *input = get_input("input/2023/02");
-    printf("Solution for Day 02 of 2023 is not completed yet\n");
-    free(input);
+    size_t sz = 0;
+    char **lines = get_lines("input/2023/02", &sz);
+    int p1 = 0, p2 = 0;
+
+    for (size_t i = 0; i < sz; ++i) {
+        struct Game g;
+        parse(lines[i], &g);
+        if (valid(&g)) {
+            p1 += g.id;
+        }
+        p2 += g.red_max * g.blue_max * g.green_max;
+    }
+
+    printf("%d\n%d\n", p1, p2);
+    del_lines(lines);
 }

src/advent_utility.c

@@ -61,3 +61,4 @@ Vector *string_to_int_vector(const char *input_string, const char* delim) {
     free(copy);
     return v;
 }
+