题目很简单,只需要注意带空格的输入用getline即可 #include <iostream> #include <vector> #include <algorithm> #include <string> #include <set> using namespace std; int main(){ string str; getline(cin,str); set<char> a; ; i < str.length()-;…

layout: post title: Codeforces Round 253 (Div. 2) author: "luowentaoaa" catalog: true tags: mathjax: true - codeforces - 模拟栈 - 贪心 传送门 A.Anton and Letters (签到) 题意 判断字符串里面有多少个不同字符 思路 直接set一下 #include<bits/stdc++.h> using namespace std; typed…

题目传送门 /* 题意:从前面找一个数字和末尾数字调换使得变成偶数且为最大 贪心:考虑两种情况:1. 有偶数且比末尾数字大(flag标记):2. 有偶数但都比末尾数字小(x位置标记) 仿照别人写的,再看自己的代码发现有清晰的思维是多重要 */ #include <cstdio> #include <iostream> #include <algorithm> #include <cmath> #include <cstring> #include…

Codeforces Round #253 (Div. 1) 题目链接 A:给定一些牌,然后如今要提示一些牌的信息,要求提示最少,使得全部牌能够被分辨出来. 思路:一共2^10种情况,直接暴力枚举,然后对于每种情况去推断,推断的时候仅仅要两两张牌枚举出来推断就可以.不得不说CF机子真心强大,2秒限制还是能跑10^8 B:给定n个发生概率,求选出当中一些事件,使得正好有一件发生的概率最大. 思路:贪心,从大到小排序概率,然后一个个概率进来推断有没有更大,有就增加该事件,没有就跳过 C:给定n个数字…

B. Anton and Lines Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/593/problem/B Description The teacher gave Anton a large geometry homework, but he didn't do it (as usual) as he participated in a regular round on Codeforc…

D. Anton and School - 2 题目连接: http://codeforces.com/contest/785/problem/D Description As you probably know, Anton goes to school. One of the school subjects that Anton studies is Bracketology. On the Bracketology lessons students usually learn differ…

B. Anton and Lines   The teacher gave Anton a large geometry homework, but he didn't do it (as usual) as he participated in a regular round on Codeforces. In the task he was given a set of n lines defined by the equations y = ki·x + bi. It was necess…

E. Anton and Tree 题目连接: http://codeforces.com/contest/734/problem/E Description Anton is growing a tree in his garden. In case you forgot, the tree is a connected acyclic undirected graph. There are n vertices in the tree, each of them is painted bla…

D. Anton and Chess 题目连接: http://codeforces.com/contest/734/problem/D Description Anton likes to play chess. Also, he likes to do programming. That is why he decided to write the program that plays chess. However, he finds the game on 8 to 8 board to…

C. Anton and Making Potions 题目连接: http://codeforces.com/contest/734/problem/C Description Anton is playing a very interesting computer game, but now he is stuck at one of the levels. To pass to the next level he has to prepare n potions. Anton has a…