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Problem Statement You are given a string S consisting of digits between 1 and 9, inclusive. You can insert the letter + into some of the positions (po 阅读全文
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Problem Statement "Teishi-zushi", a Japanese restaurant, is a plain restaurant with only one round counter. The outer circumference of the counter is 阅读全文
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Kuro is living in a country called Uberland, consisting of nn towns, numbered from 11to nn, and n−1n−1 bidirectional roads connecting these towns. It 阅读全文
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D - Handstand Time Limit: 2 sec / Memory Limit: 1024 MB Score : 400400 points Problem Statement NN people are arranged in a row from left to right. Yo 阅读全文
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链接：https://ac.nowcoder.com/acm/contest/560/D来源：牛客网 题目描述 Give you a rectangular gird which is h cells high and w cells wide. Each grid is black initial 阅读全文
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Let's suppose you have an array a, a stack s (initially empty) and an array b (also initially empty). You may perform the following operations until b 阅读全文
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D - We Like AGC Time Limit: 2 sec / Memory Limit: 1024 MB Score : 400400 points Problem Statement You are given an integer NN. Find the number of stri 阅读全文
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Bobo has a balanced parenthesis sequence P=p 1 p 2…p n of length n and q questions. The i-th question is whether P remains balanced after p ai and p b 阅读全文
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Bobo 有一个 n 个点，m 条边的有向无环图（即对于任意点 v，不存在从点 v 开始、点 v 结束的路径）。 为了方便，点用 1,2,…,n 编号。 设 count(x,y) 表示点 x 到点 y 不同的路径数量（规定 count(x,x)=0），Bobo 想知道 除以 (10 9+7) 的余数 阅读全文
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给出正整数 n 和 m，统计满足以下条件的正整数对 (a,b) 的数量： 1. 1≤a≤n,1≤b≤m; 2. a×b 是 2016 的倍数。 Input 输入包含不超过 30 组数据。 每组数据包含两个整数 n,m (1≤n,m≤10 9). Output对于每组数据，输出一个整数表示满足条件的数 阅读全文