I don't even know where to start

  • 0

    I can make a function that solves the problem, like this:

    var mergeTrees = function(t1, t2) {
        var result = [];
        for(var i = 0; i < t1.length; i++){
           result.push(t1[i] + t2[i]);
        if (t2.length > t1.length){
            for(var i = t1.length; i < t2.length; i++)
        return result;

    But is doesn't work on here, it works fine on js fiddle. Can someone link a resource to explain this portion of the code:

     * Definition for a binary tree node.
     * function TreeNode(val) {
     *     this.val = val;
     *     this.left = this.right = null;
     * }
     * @param {TreeNode} t1
     * @param {TreeNode} t2
     * @return {TreeNode}

    I know it is a comment explaining a function to me but I don't understand what it does or how to use it. I also know it isn't unique to this problem, many of the leetcode problems use something like it. Thanks for the help.

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