【LeetCode刷题-树】-- 129.求根节点到叶节点数字之和

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129.求根节点到叶节点数字之和

/*** Definition for a binary tree node.* public 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;*     }* }*/
class Solution {public int sumNumbers(TreeNode root) {if(root == null){return 0;}Queue<TreeNode> queNode = new LinkedList<TreeNode>();Queue<Integer> queVal = new LinkedList<Integer>();int ans = 0;queNode.offer(root);queVal.offer(root.val);while(!queNode.isEmpty()){TreeNode now = queNode.poll();int tmp = queVal.poll();if(now.left == null && now.right == null){ans += tmp;}if(now.left!=null){queNode.offer(now.left);queVal.offer(tmp * 10 + now.left.val);}if(now.right!=null){queNode.offer(now.right);queVal.offer(tmp * 10 + now.right.val);}}return ans;}
}

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