Create 1161-maximum-level-sum-of-a-binary-tree.js

Author: everthis

1161-maximum-level-sum-of-a-binary-tree.js

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+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {number}
+ */
+const maxLevelSum = function(root) {
+  if (root == null) return 0
+  let res = 1
+  let cur = [root]
+  let next = []
+  let max = Number.MIN_SAFE_INTEGER
+  let sum = 0
+  let level = 1
+  while (cur.length) {
+    let node = cur.pop()
+    if (node.left) next.push(node.left)
+    if (node.right) next.push(node.right)
+    sum += node.val
+    if (cur.length === 0) {
+      cur = next
+      next = []
+      if (sum > max) {
+        res = level
+        max = sum
+      }
+      sum = 0
+      level++
+    }
+  }
+
+  return res
+}