todo solve 100
https://codeforces.com/problemset?tags=1600-1600&locale=en
todo Understand the tasks
https://www.youtube.com/watch?v=LPFhl65R7ww&t=320s
https://practice.geeksforgeeks.org/problems/k-th-element-of-two-sorted-array/0
https://codeforces.com/problemset/problem/1175/C
https://www.youtube.com/watch?v=Q3JUfHpffIg
todo Capacity 500 tasks
http://acm.timus.ru/author.aspx?id=248669&sort=difficulty
Day capacity 12 tasks