Update index.html

index.html

@@ -50,7 +50,7 @@
                         if (p == 0) continue;
                         for (let [dx, dy] of [[1, 0], [0, 1], [1, 1], [-1, 1]]) {
                             var count = 0;
-                            for (let k = 1; k <= 4; k++) {
+                            for (let k = 0; k < 4; k++) {
                                 const u = i + dx * k;
                                 const v = j + dy * k;
                                 if (u < 0 || u >= this.num_rows) break;