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Main.java
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Main.java
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package com.company;
class TreeNode {
int val;
TreeNode left;
TreeNode right;
TreeNode() {}
TreeNode(int val) { this.val = val; }
TreeNode(int val, TreeNode left, TreeNode right) {
this.val = val;
this.left = left;
this.right = right;
}
}
public class Main {
public static void main(String[] args) {
// write your code here
}
int sum;
public int sumEvenGrandparent(TreeNode root) {
dfs(root);
return sum;
}
public void dfs(TreeNode node){
if(node == null) return;
if(node.val % 2 == 0){
if(node.left != null && node.left.left != null) sum += node.left.left.val;
if(node.left != null && node.left.right != null) sum += node.left.right.val;
if(node.right != null && node.right.left != null) sum += node.right.left.val;
if(node.right != null && node.right.right != null) sum += node.right.right.val;
}
dfs(node.left);
dfs(node.right);
}
}