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) { // write code here if(root==null) { return false; } if(root.left==null&&root.right==null&&sum==root.val) return true; return hasPathSum(root.left,sum-root.val)||hasPathSum(root.right,sum-root.val); } }