mikkqu

#include <iostream>
#include <vector>
#include <unordered_map>
#include <unordered_set>
#include <random>

using namespace std;

typedef vector<vector<int>> vector_2d_t;
typedef vector<vector<vector<int>>> vector_3d_t;

mikkqu

class DListNode {
    constructor(val, next = null, prev = null) {
        this.val = val
        this.next = next
        this.prev = prev
    }
}

/*

mikkqu

class ListNode {
    constructor(val, next = null) {
        this.next = next
        this.val = val
    }
}

/*
    Interface:
        insertAtHead(val)

mikkqu

class Node {
    constructor(val, prev = null, next = null, child = null) {
        this.val = val
        this.prev = prev
        this.next = next
        this.child = child
    }
}

let print = (head) => {