2022-04

src/2022/04.c

@@ -1,10 +1,49 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <limits.h>
 
 #include "lfinput.h"
+#include "advent_utility.h"
+
+struct Point parse_floors(char *input) {
+    size_t sz = 0;
+    char **sp = split(input, &sz, "-");
+    const char *errstr;
+    struct Point p;
+    p.x = strtonum(sp[0], INT_MIN, INT_MAX, &errstr);
+    p.y = strtonum(sp[1], INT_MIN, INT_MAX, &errstr);
+    free(sp);
+    return p;
+}
 
 void advent2022day04(void) {
-    char *input = get_input("input/2022/04");
-    printf("Solution for Day 04 of 2022 is not completed yet\n");
-    free(input);
+    size_t sz = 0;
+    char **lines = get_lines("input/2022/04", &sz);
+    int p1 = 0, p2 = 0;
+
+    for (size_t i = 0; i < sz; ++i) {
+        size_t sp_sz = 0;
+        char **sp = split(lines[i], &sp_sz, ",");
+        struct Point e1 = parse_floors(sp[0]);
+        struct Point e2 = parse_floors(sp[1]);
+
+        if (e1.x <= e2.x && e1.y >= e2.y) {
+            ++p1;
+        } else if (e2.x <= e1.x && e2.y >= e1.y) {
+            ++p1;
+        }
+
+        if ((e1.x >= e2.x && e1.x <= e2.y) || (e1.y >= e2.x && e1.y <= e2.y)) {
+            ++p2;
+        } else if ((e2.x >= e1.x && e2.x <= e1.y) || (e2.y >= e1.x && e2.y <= e1.y)) {
+            ++p2;
+        }
+
+        free(sp);
+    }
+
+    printf("%d\n", p1);
+    printf("%d\n", p2);
+
+    del_lines(lines);
 }