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index.js
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index.js
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/**
* Definition for a binary tree node.
* function TreeNode(val) {
* this.val = val;
* this.left = this.right = null;
* }
*/
/**
* @param {TreeNode} root
* @return {boolean}
*/
var isValidBST = function(root) {
if(!root) return true;
let rootval = root.val;
function check(root, min, max){
if(root.left){
if(root.left.val >= root.val){
return false;
}
if(min && root.left.val <= min){
return false;
}
if(!check(root.left, min, max||root.val)){
return false;
}
}
if(root.right){
if(root.right.val <= root.val){
return false;
}
if(max && root.right.val >= max){
return false;
}
if(!check(root.right, min||root.val, max)){
return false;
}
}
return true;
}
return check(root);
};