https://codeforc.es/contest/1697/problem/C 因为规则中,两种字符串变换都与'b'有关,所以我们根据b的位置来进行考虑: 先去掉所有的'b',如果两字符串不相等就"NO": 否则通过'b'在a,b串中的位置,如果posa>posb,那么他们之间如果出现'a'就说明不可能 如果posb<posa,那么他们之间如果出现'c'说明不可能 1 # include<iostream> 2 # include<bits/stdc…

题意:给串s,每次询问k个数a,l个数b,问a和b作为后缀的lcp的综合 题解:和bzoj3879类似,反向sam日神仙...lcp就是fail树上的lca.把点抠出来建虚树,然后在上面dp即可.(感觉之前写的svt什么玩意) //#pragma GCC optimize(2) //#pragma GCC optimize(3) //#pragma GCC optimize(4) //#pragma GCC optimize("unroll-loops") //#pragma comm…

D. Yet Another Subarray Problem You are given an array \(a_1, a_2, \dots , a_n\) and two integers \(m\) and \(k\). You can choose some subarray \(a_l, a_{l+1}, \dots, a_{r-1}, a_r\). The cost of subarray \(a_l, a_{l+1}, \dots, a_{r-1}, a_r\) is equal…

一.题目 D. Yet Another Subarray Problem 二.分析 公式的推导时参考的洛谷聚聚们的推导 重点是公式的推导,推导出公式后,分块是很容易想的.但是很容易写炸. 1 有些地方容易溢出,这和设置的无穷大的值的大小也有关. 2 如果每次确定了边界$r$,那么在枚举$m$的余数的情况时,一定注意到比$r$大的还不能枚举. 三.AC代码 1 #include <bits/stdc++.h> 2 3 using namespace std; 4 #define Min(a, b…

Problem   Educational Codeforces Round 60 (Rated for Div. 2) - C. Magic Ship Time Limit: 2000 mSec Problem Description Input Output The only line should contain the minimal number of days required for the ship to reach the point (x2,y2)(x2,y2). If it…

Problem   Educational Codeforces Round 60 (Rated for Div. 2) - D. Magic Gems Time Limit: 3000 mSec Problem Description Input The input contains a single line consisting of 2 integers N and M (1≤N≤10^18, 2≤M≤100). Output Print one integer, the total n…

Educational Codeforces Round 43 (Rated for Div. 2) https://codeforces.com/contest/976 A #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(x)…

Educational Codeforces Round 35 (Rated for Div. 2) https://codeforces.com/contest/911 A 模拟 #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define IT set<ll>::iterator #define sqr(…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) F. Isomorphic Strings 题目连接: http://codeforces.com/contest/985/problem/F Description You are given a string s of length n consisting of lowercase English letters. For two given strings s an…

Codeforces Educational Codeforces Round 44 (Rated for Div. 2) E. Pencils and Boxes 题目连接: http://codeforces.com/contest/985/problem/E Description Mishka received a gift of multicolored pencils for his birthday! Unfortunately he lives in a monochrome w…