[LeetCode] 98. Validate Binary Search Tree
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/** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */public class Solution { public boolean isSymmetric(TreeNode root) { if(root == null) return true; return helper(root, root.left, root.right); } private boolean helper(TreeNode root, TreeNode p, TreeNode q){ if(p == null && q == null){ return true; } if(p == null || q == null){ return false; } if(p.val != q.val){ return false; } return helper(root, p.left, q.right) && helper(root, p.right, q.left); }} 0 0
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