Update 1186-maximum-subarray-sum-with-one-deletion.js

Author: everthis

1186-maximum-subarray-sum-with-one-deletion.js

@@ -14,3 +14,29 @@ const maximumSum = function(arr) {
   }
   return best
 }
+
+// another
+
+/**
+ * @param {number[]} arr
+ * @return {number}
+ */
+const maximumSum = function (arr) {
+  const n = arr.length
+  let max = arr[0]
+  const maxEndAt = Array(n), maxStartAt = Array(n)
+  maxEndAt[0] = arr[0]
+  for(let i = 1; i < n; i++) {
+    maxEndAt[i] = Math.max(arr[i], maxEndAt[i - 1] + arr[i])
+    max = Math.max(max, maxEndAt[i])
+  }
+  maxStartAt[n - 1] = arr[n - 1]
+  for(let i = n - 2; i >= 0; i--) {
+    maxStartAt[i] = Math.max(arr[i], maxStartAt[i + 1] + arr[i])
+  }
+  let res = Math.max(maxStartAt[0], maxEndAt[n - 1])
+  for(let i = 1; i < n - 1; i++) {
+    res = Math.max(max, res, maxEndAt[i - 1] + maxStartAt[i + 1])
+  }
+  return res
+}