Time Stamp
0:00 Problem 1 - E. Sending a Sequence Over the Network
13:03 Problem 2 - B. Meeting on the Line
29:47 Problem 3 - E. Counting Rectangles
Links of Problems
Problem 1 - https://codeforces.com/problemset/problem/1741/E
Problem 2 - https://codeforces.com/problemset/problem/1730/B
Problem 3 - https://codeforces.com/problemset/problem/1722/E