Update 1306-jump-game-iii.js

Author: everthis

1306-jump-game-iii.js

@@ -15,3 +15,19 @@ function helper(arr, start, s) {
 
   return helper(arr, start + arr[start], s) || helper(arr, start - arr[start], s)
 }
+
+// another
+
+/**
+ * @param {number[]} arr
+ * @param {number} start
+ * @return {boolean}
+ */
+const canReach = function (A, i) {
+  return (
+    0 <= i &&
+    i < A.length &&
+    A[i] >= 0 &&
+    (!(A[i] = -A[i]) || canReach(A, i + A[i]) || canReach(A, i - A[i]))
+  )
+}