原题链接:http://codeforces.com/contest/584/problem/C 题意: 定义$f(s1,s2)$为$s1,s2$不同的字母的个数.现在让你构造一个串$s3$,使得$f(s1,s3)=f(s2,s3)=t$. 题解: 设$s1,s2$共有$a$个相同的字母,共有$b$个不同的字母.现在在这$a$个相同的字母中,我让$s3$有$x$个字母和$s1,s2$不同:在这$b$个不同的字母中,我让$s3$有$y$个字母和$s1,s2$都不相同,有$z$个字母和$s1$不同.…

D. Once Again... time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array of positive integers a1, a2, ..., an × T of length n × T. We know that for any i > n it is true that …

---恢复内容开始--- Codeforces Round #324 (Div. 2) Problem A 题目大意:给二个数n.t,求一个n位数能够被t整除,存在多组解时输出任意一组,不存在时输出“-1”. 数据范围: 1 ≤ n ≤ 100, 2 ≤ t ≤ 10 so easy!首先考虑无解的时候,只有当n==1,t==10是无解,其他情况都存在解.很容易想到最简单的n位数能被t整除的数是,t个n组成的数. 参考代码: By Royecode, contest: Codeforces Ro…

C. Marina and Vasya Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/584/problem/C Description Marina loves strings of the same length and Vasya loves when there is a third string, different from them in exactly t characters.…

                                                      C. Marina and Vasya   Marina loves strings of the same length and Vasya loves when there is a third string, different from them in exactly t characters. Help Vasya find at least one such string. M…

A. Vasya and Football 题目连接: http://codeforces.com/contest/493/problem/A Description Vasya has started watching football games. He has learned that for some fouls the players receive yellow cards, and for some fouls they receive red cards. A player wh…

CF的rating设置改了..人太多了,决定开小号打,果然是明智的选择! 水 A - Olesya and Rodion #include <bits/stdc++.h> using namespace std; typedef long long ll; const int N = 1e5 + 10; const int INF = 0x3f3f3f3f; int main(void) { int n, t; scanf ("%d%d", &n, &t);…

A的万般无奈...后来跑了大牛的这份代码发现, 题意是求一个序列与给定的两个序列有t个不同. 只要保证...对应位置就行了.. 所以处理起来非常方便.............. 可是没有感觉是对应位置啊瞎几把想了一堆.后来真的是. 再后来? 我觉得非常好的就是又多了那么点见识.. #include <bits/stdc++.h> using namespace std; typedef long long LL; typedef unsigned long long ULL; const do…

题目链接:http://codeforces.com/contest/734/problem/C 题意: 玩一个游戏,一开始升一级需要t秒时间,现在有a, b两种魔法,两种魔法分别有m1, m2种效果: 对应使用a1[i]魔法需要a2[i]金币,使用b1[i]魔法需要b2[i]金币: 每种魔法最多只能使用一次,问升到n(n<=1e+5)级最少需要多少时间: 注意:给出的b1, b2数组是升序排列的: 思路:对每一个a魔法找到最大的b1魔法jj, 即为使用此a魔法需要最少时间的情况:再找到所有jj…

E. Anton and Ira Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/584/problem/E Description Anton loves transforming one permutation into another one by swapping elements for money, and Ira doesn't like paying for stupid game…