題目

https://leetcode.com/problems/binary-tree-pruning/

題解

思路很簡單，看草稿：

/*** 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 TreeNode pruneTree(TreeNode root) {if (retain(root)) return root;else return null;}public boolean retain(TreeNode node) {if (node == null) return false;boolean l = retain(node.left);boolean r = retain(node.right);if (!l) node.left = null;if (!r) node.right = null;return l || r || node.val == 1;} }

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