1:06:31

Sheet 3 - upsolve part 1

1:25:11

Sheet 3 - upsolve part 2

2:31:20

Sheet 1 - upsolve part 2

3:23:45

Sheet 5 - Upsolve part 2

1:05:21

Codeforces Round 849 (Div. 4) | All Problems Explanation

1:26:32

sheet 4 - upsolve part 2

1:28:29

Sheet 6 - upsolve part 2

2:27:22

Sheet 5 - Upsolve part 1