someng的博客

http://codeforces.com/contest/999/problem/A问题描述：Mishka started participating in a programming contest. There are nn problems in the contest. Mishka's problem-solving skill is equal to kk.Mishka arrang...

http://codeforces.com/contest/1029 A. Many Equal Substrings You are given a string t consisting of n lowercase Latin letters and an integer number kk. Let’s define a substring of some string s with...

https://codeforces.com/contest/846/problem/D 问题描述 Recently Luba bought a monitor. Monitor is a rectangular matrix of size n × m. But then she started to notice that some pixels cease to work properl...

https://codeforces.com/problemset/problem/19/D 问题描述 Pete and Bob invented a new interesting game. Bob takes a sheet of paper and locates a Cartesian coordinate system on it as follows: point (0, 0) ...

http://codeforces.com/contest/732/problem/D 问题描述 Vasiliy has an exam period which will continue for n days. He has to pass exams on m subjects. Subjects are numbered from 1 to m. About every day we...

https://codeforces.com/contest/161/problem/D# 问题描述 A tree is a connected graph that doesn’t contain any cycles. The distance between two vertices of a tree is the length (in edges) of the shortest ...

https://codeforces.com/contest/676/problem/D 问题描述 Theseus has just arrived to Crete to fight Minotaur. He found a labyrinth that has a form of a rectangular field of size n × m and consists of block...

http://codeforces.com/contest/510/problem/C 问题描述 Fox Ciel is going to publish a paper on FOCS (Foxes Operated Computer Systems, pronounce: “Fox”). She heard a rumor: the authors list on the paper is...

http://codeforces.com/contest/4/problem/D 问题描述 Peter decided to wish happy birthday to his friend from Australia and send him a card. To make his present more mysterious, he decided to make a chain....

http://codeforces.com/problemset/problem/208/C 问题描述 The Berland road network consists of n cities and of m bidirectional roads. The cities are numbered from 1 to n, where the main capital city has n...

http://codeforces.com/contest/999/problem/F问题描述：There are nn players sitting at the card table. Each player has a favorite number. The favorite number of the jj-th player is fjfj.There are k⋅nk⋅n card...

问题描述：There are nn cities and mm roads in Berland. Each road connects a pair of cities. The roads in Berland are one-way.What is the minimum number of new roads that need to be built to make all the ci...

http://codeforces.com/contest/999/problem/D问题描述：You are given an array consisting of nn integers a1,a2,…,ana1,a2,…,an, and a positive integer mm. It is guaranteed that mm is a divisor of nn.In a singl...

问题描述：You are given a string ss consisting of nn lowercase Latin letters. Polycarp wants to remove exactly kk characters (k≤nk≤n) from the string ss. Polycarp uses the following algorithm kk times:if t...

http://codeforces.com/contest/999/problem/B问题描述：A string ss of length nn can be encrypted by the following algorithm:iterate over all divisors of nn in decreasing order (i.e. from nn to 11),for each d...

http://codeforces.com/contest/1028 A. Find Square Consider a table of size n*m, initially fully white. Rows are numbered 11 through nn from top to bottom, columns 1 through m from left to right. Som...