Add day 2

1 files changed, 35 insertions, 0 deletions

diff --git a/2/part1.c b/2/part1.c
new file mode 100644
index 0000000..ddac78e
--- /dev/null
+++ b/2/part1.c
@@ -0,0 +1,35 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+bool is_valid_password(char * pass, char * policy)
+{
+    int min = atoi(policy);
+    char * minP = strchr(policy, '-');
+    int max = atoi(++minP);
+    char c = *(strchr(minP, ' ') + 1);
+    char * p = pass;
+    int occ = 0;
+    do {
+        if (*p == c) {
+            occ++;
+        }
+    } while (*++p);
+
+    return occ >= min && occ <= max;
+}
+
+int main()
+{
+    FILE * file = fopen("input", "r");
+    char buffer[128] = { 0 };
+    int valid = 0;
+    while (fgets(buffer, 128, file)) {
+        if (is_valid_password(strchr(buffer, ':') + 2, buffer)) {
+            valid++;
+        }
+    }
+
+    printf("%i", valid);
+}