B. The Best Gift 题目连接: http://www.codeforces.com/contest/609/problem/B Description Emily's birthday is next week and Jack has decided to buy a present for her. He knows she loves books so he goes to the local bookshop, where there are n books on sale…

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…

除非特别忙,我接下来会尽可能翻译我做的每道CF题的题面! Codeforces 148D 一袋老鼠 Bag of mice | 概率DP 水题 题面 胡小兔和司公子都认为对方是垃圾. 为了决出谁才是垃圾,大哥拿来了一袋老鼠,其中有w只白老鼠和b只黑老鼠.胡小兔先抓,先抓到白老鼠的人赢. 每次学姐抓完老鼠之后,总会有另外一只老鼠从袋子里自己跑出来(这只老鼠不算任何人抓的),而胡小兔抓老鼠时则不会发生这样的事. 每次袋子里的每只老鼠被抓到的概率相等,当有一只老鼠跑出来的时候,每只老鼠跑出来的几率也相…

D. Road to Post Office time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Vasiliy has a car and he wants to get from home to the post office. The distance which he needs to pass equals to d ki…

A. Fashion in Berland 题目连接: http://www.codeforces.com/contest/691/problem/A Description According to rules of the Berland fashion, a jacket should be fastened by all the buttons except only one, but not necessarily it should be the last one. Also if…

题目链接:http://codeforces.com/contest/818 A. Diplomas and Certificates 题解:水题 #include <iostream> #include <cstring> #include <cmath> using namespace std; typedef long long ll; int main() { ll n , k; cin >> n >> k; ll gg = n / 2;…

B. Archer Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/312/problem/B Description SmallR is an archer. SmallR is taking a match of archer with Zanoes. They try to shoot in the target in turns, and SmallR shoots first. The…

A. Letter 题目连接: http://www.codeforces.com/contest/14/problem/A Description A boy Bob likes to draw. Not long ago he bought a rectangular graph (checked) sheet with n rows and m columns. Bob shaded some of the squares on the sheet. Having seen his mas…

A. Opponents 题目连接: http://www.codeforces.com/contest/688/problem/A Description Arya has n opponents in the school. Each day he will fight with all opponents who are present this day. His opponents have some fighting plan that guarantees they will win…