usaco-guide/content/models.ts

const sources = {
  "AC": "https://atcoder.jp/",
  "CC": "https://www.codechef.com/problems/",
  "CSA": "https://csacademy.com/contest/archive/task/",
  "DMOJ": "https://dmoj.ca/problem/",
  "SPOJ": "https://www.spoj.com/problems/",
  "YS": "https://judge.yosupo.jp/problem/",
  "CF": "https://codeforces.com/",
  "Bronze": "http://www.usaco.org/index.php?page=viewproblem2&cpid=",
  "Silver": "http://www.usaco.org/index.php?page=viewproblem2&cpid=",
  "Gold": "http://www.usaco.org/index.php?page=viewproblem2&cpid=",
  "Old Bronze": "http://www.usaco.org/index.php?page=viewproblem2&cpid=",
  "Old Silver": "http://www.usaco.org/index.php?page=viewproblem2&cpid=",
  "Old Gold": "http://www.usaco.org/index.php?page=viewproblem2&cpid=",
  "Plat": "http://www.usaco.org/index.php?page=viewproblem2&cpid=",
  "Kattis": "https://open.kattis.com/problems/",
  "CSES": "https://cses.fi/problemset/task/",
  "LC": "https://leetcode.com/problems/",
  "ojuz": "https://oj.uz/problem/view/",
  "HR": "https://www.hackerrank.com/",
};

export class Problem {
  public url: string;
  public difficulty: 'Very Easy' | 'Easy' | 'Normal' | 'Hard' | 'Very Hard' | 'Insane';
  public isIntro: boolean;

  constructor(
    public source: string,
    public name: string,
    public id: string,
    labels?: 'Very Easy' | 'Easy' | 'Normal' | 'Hard' | 'Very Hard' | 'Insane' | 'Intro|Very Easy' | 'Intro|Easy' | 'Intro|Normal' | 'Intro|Hard' | 'Intro|Very Hard' | 'Intro|Insane',
    public starred?: boolean,
    public tags?: string[],
    public sketch?: string,
  ) {
    this.isIntro = labels && labels.includes("Intro|");
    if (labels) labels = labels.replace("Intro|", "") as any;
    this.difficulty = labels as any;
    if (!id.startsWith("http")) {
      if (source in sources) {
        this.url = sources[source] + id;
      } else throw `URL ${id} is not valid. Did you make a typo in the problem source (${source}), or in the URL? Problem name: ${name}`
    } else this.url = id;
  }
}