951-flip-equivalent-binary-trees

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js

/**
 * Definition for a binary tree node.
 * function TreeNode(val, left, right) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.left = (left===undefined ? null : left)
 *     this.right = (right===undefined ? null : right)
 * }
 */
/**
 * @param {TreeNode} root1
 * @param {TreeNode} root2
 * @return {boolean}
 */
var flipEquiv = function(root1, root2) {

    let helper = function(root1, root2){
        if(!root1 && !root2){
            return true;
        }
        if(!root1 || !root2){
            return false;
        }
        if(root1.val !== root2.val){
            return false;
        }

        let flip = helper(root1.left,root2.right) && helper(root1.right,root2.left);
        let noFlip = helper(root1.left,root2.left) && helper(root1.right,root2.right);

        return flip || noFlip;
    }

    return helper(root1,root2);

};