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Solution.cs
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35 lines (34 loc) · 754 Bytes
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/**
* Definition for a binary tree node.
* public class TreeNode {
* public int val;
* public TreeNode left;
* public TreeNode right;
* public TreeNode(int val=0, TreeNode left=null, TreeNode right=null) {
* this.val = val;
* this.left = left;
* this.right = right;
* }
* }
*/
public class Solution
{
int ans = 0;
public int SumRootToLeaf(TreeNode root)
{
DFS(root, 0);
return ans;
}
void DFS(TreeNode root, int val)
{
if (root is null) return;
val = (val << 1) | root.val;
if (root.left == root.right)
{
ans += val;
return;
}
DFS(root.left, val);
DFS(root.right, val);
}
}