Vitya has just started learning Berlanese language. It is known that Berlanese uses the Latin alphabet. Vowel letters are "a", "o", "u", "i", and "e". Other letters are consonant. In Berlanese, there has t…
(CodeForces - 5C)Longest Regular Bracket Sequence time limit per test:2 seconds memory limit per test:256 megabytes input:standard input output:standard output This is yet another problem dealing with regular bracket sequences. We should remind you t…
题意 有n个黑帮(gang),每个黑帮有siz[i]个人,黑帮与黑帮之间有有向边,并形成了一个竞赛完全图(即去除方向后正好为一个无向完全图).在很多年前,有一些人参与了一次大型抢劫,参与抢劫的人都获得了一个真金条. 在这些年间,不同的黑帮之间进行了交易.具体过程是: 在时刻i,假如有一条边是u->v,那么u帮派中的i mod siz[u]号如果有金条(无论真假),并且v帮的i mod siz[v]没有任何金条,那么u中的这个人就会向v中的这个人一个假金条. 经过无数年的交易之后,各个帮派的金条拥…
Description You are given a positive integer nn. Let S(x) be sum of digits in base 10 representation of xx, for example, S(123)=1+2+3=6, S(0)=0. Your task is to find two integers a,ba,b, such that 0≤a,b≤n, a+b=n and S(a)+S(b) is the largest possible…
You are given two arithmetic progressions: a1k + b1 and a2l + b2. Find the number of integers x such that L ≤ x ≤ R and x = a1k' + b1 = a2l' + b2, for some integers k', l' ≥ 0. Input The only line contains six integers a1, b1, a2, b2, L, R (0 < a1, a…
题目链接:http://codeforces.com/problemset/problem/510/C 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 always sorted in the lexicographical order.…
Vasya came up with a password to register for EatForces — a string ss. The password in EatForces should be a string, consisting of lowercase and uppercase Latin letters and digits. But since EatForces takes care of the security of its users, user pas…
D. Bag of mice time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The dragon and the princess are arguing about what to do on the New Year's Eve. The dragon suggests flying to the mountains t…
Description Memory is performing a walk on the two-dimensional plane, starting at the origin. He is given a string s with his directions for motion: An 'L' indicates he should move one unit left. An 'R' indicates he should move one unit right. A 'U'…
Since Sonya is interested in robotics too, she decided to construct robots that will read and recognize numbers. Sonya has drawn nn numbers in a row, aiai is located in the ii-th position. She also has put a robot at each end of the row (to the left…
Helen works in Metropolis airport. She is responsible for creating a departure schedule. There are n flights that must depart today, the i-th of them is planned to depart at the i-th minute of the day. Metropolis airport is the main transport hub of…
