Money Savings
Overlapping Matrices
Palindrome Free Strings
Parentrisis
Partial Maximums
Codeforces Round 558 (Div. 2) C2. Power Transmission (Hard Edition)
Codeforces Round 558 (Div. 2) C1. Power Transmission (Easy Edition)
Codeforces Round 564 (Div. 1) B. Nauuo and Circle
Codeforces Round 563 (Div. 2) D. Ehab and the Expected XOR Problem
Educational Codeforces Round 66 (Rated for Div. 2) D. Array Splitting