Create 1315-sum-of-nodes-with-even-valued-grandparent.js

Author: everthis

1315-sum-of-nodes-with-even-valued-grandparent.js

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+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val, left, right) {
+ *     this.val = (val===undefined ? 0 : val)
+ *     this.left = (left===undefined ? null : left)
+ *     this.right = (right===undefined ? null : right)
+ * }
+ */
+/**
+ * @param {TreeNode} root
+ * @return {number}
+ */
+const sumEvenGrandparent = function(root) {
+  let res = 0
+  dfs(root, null, null)
+  return res
+  
+  
+  function dfs(node, parent, gp) {
+    if(node == null) return
+    if(parent && gp && gp.val % 2 === 0) {
+      res += node.val
+    }
+    dfs(node.left, node, parent)
+    dfs(node.right, node, parent)
+  }
+  
+};