cleanup

S1/GdCP/a02.c

@@ -0,0 +1,9 @@
+int sequence(int x, int n){
+  if (n < 0) return 0;
+  for (int i = 0; i < n; i++) {
+    if (x % 2 == 0) x = x/2;
+    else x = 3 * x + 1;
+    if (x < 0) return -1;
+  }
+  return x;
+};