لینک سوالات کارگاه امروز که قرار هست بررسی شوند:Dfs and Bfs:
https://codeforces.com/problemset/problem/320/B
https://codeforces.com/problemset/problem/862/B
Number theory:
https://codeforces.com/problemset/problem/1855/B
https://codeforces.com/problemset/problem/1838/C
