Codeforces 1084C - The Fair Nut and String题解链接https://lucien.ink题目链接https://codeforces.com/contest/1084/problem/C题意 给你一串字符串，问你能选出多少个形如 aba 这样的子序列（任意两个 a 之间至少包含一个 b），a 也算，aba 与 abba 与 ab*...
单个题目的链接Codeforces 1080A - Petya and OrigamiCodeforces 1080B - Margarite and the best presentCodeforces 1080C - Masha and two friendsCodeforces 1080D - Olya and magical squareCodeforces 1080E - Sony...
Codeforces 1080F - Katya and Segments Sets - 可持久化线段树题解链接https://lucien.ink题目链接https://codeforces.com/contest/1080/problem/F题目It is a very important day for Katya. She has a test in a programming cl...