Given the root of a binary tree and an integer targetSum, return true if the tree has a root-to-leaf path such that adding up all the values along the path equals targetSum.
A leaf is a node with no children.
Example 1:
Input: root = [5,4,8,11,null,13,4,7,2,null,null,null,1], targetSum = 22
Output: true
Example 2:
Input: root = [1,2,3], targetSum = 5
Output: false
Example 3:
Input: root = [1,2], targetSum = 0
Output: false
Constraints:
- The number of nodes in the tree is in the range [0, 5000].
- -1000 <= Node.val <= 1000
- -1000 <= targetSum <= 1000
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
class Solution {
public boolean hasPathSum(TreeNode root, int sum) {
if(root==null){
return false;
}
if(root.left==null&&root.right==null){
return root.val==sum;
}
return hasPathSum(root.left,sum-root.val)||hasPathSum(root.right,sum-root.val);
}
}