17-01

src/2017/01.c

@@ -1,10 +1,33 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "lfinput.h"
 
 void advent2017day01(void) {
     char *input = get_input("input/2017/01");
-    printf("Solution for Day 01 of 2017 is not completed yet\n");
+    const size_t sz = strlen(input);
+    int p1 = 0, p2 = 0;
+
+    for (size_t i = 0; i < sz - 1; ++i) {
+        if (input[i] == input[i + 1]) {
+            p1 += input[i] - '0';
+        }
+    }
+    if (input[sz - 1] == input[0]) {
+        p1 += input[0] - '0';
+    }
+
+    printf("%d\n", p1);
+
+    for (size_t i = 0; i < sz; ++i) {
+        size_t j = (i + sz / 2) % sz;
+        if (input[i] == input[j]) {
+            p2 += input[i] - '0';
+        }
+    }
+
+    printf("%d\n", p2);
+
     free(input);
 }