choisungyu

Array.prototype.isSubsetOf = function(array) {
    // TODO: Your code here!
    let stringify = (arr) => {
      return arr.map(ele => {
        return JSON.stringify(ele);
      });
    }
  
    let thisElement = stringify(this);
    let arrayElement = stringify(array);

choisungyu

class Graph {
  constructor() {
    this.nodes = {};
  }

  addNode(node) {
    this.nodes[node] = this.nodes[node] || [];
  }

  contains(node) {