In this video I have explained the solutions for Codeforces Round 972 (Div. 2)
Intro - 0:00
A. Simple Palindrome - 0:53
B1. The Strict Teacher (Easy Version) - 15:55
B2. The Strict Teacher (Hard Version) - 32:25
C. Lazy Narek - 41:48
D. Alter the GCD - 1:00:12
