1268. Little Chu Time limit: 0.25 secondMemory limit: 64 MB The favorite occupation of Little Chu is to sleep. Strictly speaking, he is busy with nothing but sleeping. Sometimes he wakes up and than the mankind makes some Great Discovery. For the fir…

51Nod  1268  和为K的组合 1268 和为K的组合 基准时间限制:1 秒 空间限制:131072 KB 分值: 20 难度:3级算法题 给出N个正整数组成的数组A,求能否从中选出若干个,使他们的和为K.如果可以,输出:"Yes",否则输出"No". Input 第1行:2个数N, K, N为数组的长度, K为需要判断的和(2 <= N <= 20,1 <= K <= 10^9) 第2 - N + 1行:每行1个数,对应数组的元素A…

题目链接 题意:求给定的字符串的最长回文子串 分析:做法是构造一个新的字符串是原字符串+反转后的原字符串(这样方便求两边回文的后缀的最长前缀),即newS = S + '$' + revS,枚举回文串中心位置,RMQ询问LCP = min (height[rank[l]+1] to height[rank[r]]),注意的是RMQ传入参数最好是后缀的位置,因为它们在树上的顺序未知,且左边还要+1. #include <cstdio> #include <algorithm> #in…

2071. Juice Cocktails Time limit: 1.0 secondMemory limit: 64 MB Once n Denchiks come to the bar and each orders a juice cocktail. It could be from 1 to 3 different juices in each cocktail. There are three juices in the bar: apple, banana and pineappl…

2073. Log Files Time limit: 1.0 secondMemory limit: 64 MB Nikolay has decided to become the best programmer in the world! Now he regularly takes part in various programming contests, attentively listens to problems analysis and upsolves problems. But…

2070. Interesting Numbers Time limit: 2.0 secondMemory limit: 64 MB Nikolay and Asya investigate integers together in their spare time. Nikolay thinks an integer is interesting if it is a prime number. However, Asya thinks an integer is interesting i…

2069. Hard Rock Time limit: 1.0 secondMemory limit: 64 MB Ilya is a frontman of the most famous rock band on Earth. Band decided to make the most awesome music video ever for their new single. In that music video Ilya will go through Manhattan standi…

2068. Game of Nuts Time limit: 1.0 secondMemory limit: 64 MB The war for Westeros is still in process, manpower and supplies are coming to an end and the winter is as near as never before. The game of thrones is unpredictable so Daenerys and Stannis…

2067. Friends and Berries Time limit: 2.0 secondMemory limit: 64 MB There is a group of n children. According to a proverb, every man to his own taste. So the children value strawberries and raspberries differently. Let’s say that i-th child rates hi…

2066. Simple Expression Time limit: 1.0 secondMemory limit: 64 MB You probably know that Alex is a very serious mathematician and he likes to solve serious problems. This is another problem from Alex. You are given three nonnegative integers a, b, c.…