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MR Mystery Box
  reveal -> MR Character
  
MR Character
  equip -> 

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// Includes functions for exporting active sheet or all sheets as JSON object (also Python object syntax compatible).
// Tweak the makePrettyJSON_ function to customize what kind of JSON to export.

var FORMAT_ONELINE   = 'One-line';
var FORMAT_MULTILINE = 'Multi-line';
var FORMAT_PRETTY    = 'Pretty';

var LANGUAGE_JS      = 'JavaScript';
var LANGUAGE_PYTHON  = 'Python';

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//SPDX-License-Identifier: Unlicense
pragma solidity ^0.7.0;

import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/utils/EnumerableSet.sol";

library OfferManager {
    using EnumerableSet for EnumerableSet.UintSet;
    using EnumerableSet for EnumerableSet.AddressSet;
    using Counters for Counters.Counter;

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function MergeSort() { }

MergeSort.prototype.sort = function(values) {
  if (values.length < 2) {
    return values;
  }
    
  var mid = Math.floor(values.length/2);
  var left = this.sort(values.slice(0, mid));
  var right = this.sort(values.slice(mid, values.length));

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// LRUCache.js - super simple JavaScript Implementation
// LRU stands for "Least Recently Used"
// https://en.wikipedia.org/wiki/Cache_replacement_policies#LRU

// -----------------------------------------

function LRUNode(key) {
  this.key = key;
  this.next = this.prev = null;
}

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// Trie.js - super simple JS implementation
// https://en.wikipedia.org/wiki/Trie

// -----------------------------------------

// we start with the TrieNode
function TrieNode(key) {
  // the "key" value will be the character in sequence
  this.key = key;
  

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// Implement a Graph
// basic operations:
//  - add vertex (node)
//  - add edge (node -> node)

function GraphNode(val) {
  this.val = val;
  this.edges = {};
}

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// Implement a Queue using LinkedLists
// we know that queue is LIFO
// operations: enqueue, dequeue

function QueueNode(val) {
  this.val = val;
  this.next = null;
}

function Queue() {

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// Implement a stack using LinkedLists.
// Operations:
//  -> push
//  -> pop
//  -> peek


function StackNode(val) {
  this.val = val;
  this.next = null;

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// Implement a min heap:

// -> insert, extract_min

// property: 
// - elements are in ascending order
// - complete binary tree (node is smaller than it’s children)
// - root is the most minimum
// - insert takes O(logn) time
//     - insert to the bottom right