653-Two_Sum_IV.html

<html>
<script>

var findTarget = function(root, k) {
    let set = new Set();
    let found = false;
    
    let pushValue = function(node){
        if(found) return;        
        else if(!node) return;
        else{            
            if(set.has(k - node.val)){
                found = true;
                return;                    
            }                  
            set.add(node.val);
            pushValue(node.left);
            pushValue(node.right);
        }
    }        
    pushValue(root);    
    return found;        
};

console.log(findTarget([5,3,6,2,4,null,7]));

</script>
</html>