单个题目的链接Codeforces 1080A - Petya and OrigamiCodeforces 1080B - Margarite ...

Codeforces 1080F - Katya and Segments Sets - 可持久化线段树题解链接https://lucien.i...

Codeforces 1080E - Sonya and Matrix Beauty - Manacher题解链接https://lucien....

Codeforces 1080D - Olya and magical square - 思维题解链接https://lucien.ink题目链...

Codeforces 1080C - Masha and two friends - 容斥题解链接https://lucien.ink题目链接h...

Codeforces 1080B - Margarite and the best present题解链接https://lucien.ink题...