Update 992-subarrays-with-k-different-integers.js

Author: everthis

992-subarrays-with-k-different-integers.js

@@ -7,7 +7,7 @@ const subarraysWithKDistinct = function(A, K) {
   let res = 0
   let prefix = 0
   const m = new Array(A.length + 1).fill(0)
-  for (let i = 0, j = 0, cnt = 0; i < A.length; i++) {
+  for (let i = 0, j = 0, cnt = 0, len = A.length; i < len; i++) {
     if (m[A[i]]++ === 0) cnt++
     if (cnt > K) {
       m[A[j++]]--