Codeforces 1080D - Olya and magical square - 思维题解链接https://lucien.ink题目链接https://codeforces.com/contest/1080/problem/D题目Recently, Olya received a magical square with the size of $2^n\times 2^n$.It ...
Codeforces 1088D - Ehab and another another xor problem题解链接https://lucien.ink题目链接https://codeforces.com/contest/1088/problem/D题目This is an interactive problem!Ehab plays a game with Laggy. Ehab has...