公式都给你了…用坏键把连续的好键隔开,单独算加起来就行了,但是计算过程中会超出int,所以要开long long 代码: #include<bits/stdc++.h>usingnamespacestd;typedefpair<int,int> P;typedeflonglongLL;#definefi first#definesc second#definepb(a) push_back(a)#definemp(a,b) make_pair(a,b)#definept...
https://codeforces.com/contest/1272/problem/C 题意: Recently, Norge found a string s=s1s2…sn consisting of n lowercase Latin letters. As an exercise to improve his typing speed, he decided to type all substrings of the string s. Yes, all n(n+1)2 of them! A substring of s is a...
Yet Another Broken Keyboard[双指针] 题目大意: 求贡献,已知公式n*(n+1)/2,求总和 收获: long long的转换技巧只能在乘或除上进行 题目链接 #include<bits/stdc++.h>typedeflonglongll;usingnamespacestd;constintN=2e5+10;intmain() {intn,k;cin>>n>>k;set<char>st;strings,s1; cin>>s;chartmp;...
【CodeForces 1249A --- Yet Another Dividing into Teams】 Description You are a coach of a group consisting of n students. The i-th student has programming skill ai. All students have distinct programming skills. You want to divide them into teams in such a way that: No two students i a...