Equal subarrays
Palindrome queries
Binary numbers
Technocup 2021 - Elimination Round 2 D. XOR-gun
Codeforces Round 673 (Div. 1) B. Make Them Equal
Codeforces Round 673 (Div. 1) C. XOR Inverse
Codeforces Round 674 (Div. 3) F. Number of Subsequences
Codeforces Global Round 11 C. The Hard Work of Paparazzi
Minimum AND xor OR
The Logic game