part 2 day 1

01/main.c

@@ -1,12 +1,12 @@
 #include <stdlib.h>
 #include <stdio.h>
 
-int
-main()
+void
+first()
 {
     int prev = -1;
     int total = 0;
-    
+
     static char buffer[1024];
     FILE *f = fopen("input", "r");
 
@@ -18,9 +18,70 @@ main()
         prev = val;
     }
 
-    printf("total increasing: %d\n", total);
+    printf("part 1: %d\n", total);
+
+    fclose(f);
+}
+
+int
+count_lines()
+{
+    int total = 0;
+    static char buf[256];
+    FILE *f = fopen("input", "r");
+    while(fgets(buf, 256, f))
+        total++;
+    fclose(f);
+    return total;
+}
+
+int*
+load_all(int count)
+{
+    int *i = calloc(sizeof(int), count);
+
+    int idx = 0;
+    static char buf[256];
+    FILE *f = fopen("input", "r");
+
+    while(fgets(buf, 256, f)) {
+        i[idx] = atoi(buf);
+        idx++;
+    }
 
     fclose(f);
 
+    return i;
+}
+
+void
+second()
+{
+    int count = count_lines();
+    int *values = load_all(count);
+
+    int totals = 0;
+    int lastsum = -1;
+
+    for(int i = 0; i < count; ++i) {
+        if(i + 2 < count) {
+            int sum = values[i] + values[i+1] + values[i+2];
+            if(lastsum != -1 && sum > lastsum) {
+                totals++;
+            }
+            lastsum = sum;
+        }
+    }
+
+    printf("part 2: %d\n", totals);
+
+    free(values);
+}
+
+int
+main()
+{
+    first();
+    second();
     return 0;
 }