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摘要： You are given n segments on a line. There are no ends of some segments that coincide. For each segment find the number of segments it contains. Input 阅读全文

摘要： Devu wants to decorate his garden with flowers. He has purchased n boxes, where the i-th box contains fi flowers. All flowers in a single box are of t 阅读全文

摘要： Times：5000ms； Memory limit：262144 kB 给定字符串S（|S|<=5000），下标由1开始。然后Q个问题（Q<=1e6），对于每个问题，给定L，R，回答区间[L,R]里有多少个回文串。 请想出两种或者以上的方法。 分界线 方法1：区间DP。 容斥一下，dp[i][j] 阅读全文

摘要： Genos recently installed the game Zuma on his phone. In Zuma there exists a line of n gemstones, the i-th of which has color ci. The goal of the game 阅读全文

摘要： Ivan has n different boxes. The first of them contains some balls of n different colors. Ivan wants to play a strange game. He wants to distribute the 阅读全文

摘要： Today Pari and Arya are playing a game called Remainders. Pari chooses two positive integer x and k, and tells Arya k but not x. Arya have to find the 阅读全文

摘要： Sereja has a bracket sequence s1, s2, ..., sn, or, in other words, a string s of length n, consisting of characters "(" and ")". Sereja needs to answe 阅读全文

摘要： 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) is l 阅读全文

摘要： To stay woke and attentive during classes, Karen needs some coffee! Karen, a coffee aficionado, wants to know the optimal temperature for brewing the 阅读全文

摘要： We already know of the large corporation where Polycarpus works as a system administrator. The computer network there consists of n computers and m ca 阅读全文