LeetCode -- Validate Binary Search Tree

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/**
 * Definition for a binary tree node.
 * public class TreeNode {
 *     public int val;
 *     public TreeNode left;
 *     public TreeNode right;
 *     public TreeNode(int x) { val = x; }
 * }
 */
public class Solution {
    public bool IsValidBST(TreeNode root) 
    {
        var result = new List<int>();
    	Travel(root, ref result);
    	
    	for(var i = 0;i < result.Count - 1; i++){
    		if(result[i+1] <= result[i]){
    			return false;
    		}
    	}
    	
    	return true;
    }


private void Travel(TreeNode node ,ref List<int> result)
{
	if(node == null){
		return;
	}
	
	Travel(node.left, ref result);
	result.Add(node.val);
	Travel(node.right, ref result);
}
}

LeetCode -- Validate Binary Search Tree

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原文地址：http://blog.csdn.net/lan_liang/article/details/49188109