import java.util.*;
/*
* public class TreeNode {
* int val = 0;
* TreeNode left = null;
* TreeNode right = null;
* }
*/
public class Solution {
/**
*
* @param root TreeNode类
* @param sum int整型
* @return bool布尔型
*/
public boolean hasPathSum (TreeNode root, int sum) {
if(root==null){
return false;
}
if(root.left==null && root.right==null){
if(sum-root.val==0){
return true;
}else{
return false;
}
}
return hasPathSum(root.left,sum-root.val) || hasPathSum(root.right,sum-root.val);
}
}