#include <cstdio> #include <cstring> #include <algorithm> using namespace std; ],b[]; int main() { int n; while(scanf("%d",&n)!=EOF) { ; i<=n; i++) scanf("%d",a+i); ,top1=; ; i<=n; i++) { b[++top]=i; while(t…

1494 之前记得数据结构试卷上有这种题 就是判断某一出栈顺序 是不是满足以1.2...n为入栈顺序 a1,a2,a3..an; 对于任意相邻a[i],a[i+1] 如果a[i]>a[i+1]+1 那么它两之间的数肯定已经在前面出栈过了 不然中间的不出栈 a[i+1]不可能出来 这一个条件就可以判断了 用数状数组求下和 就行了 #include <iostream> #include<cstdio> #include<cstring> #include<al…

http://www.lydsy.com/JudgeOnline/problem.php?id=1494 这道题..因为k很小,而且我们只关心连续的k个节点的连通性,所以把连续的k个点轮廓线上的连通性的最小表示当做状态来转移. 转移可以构造一个矩阵,构造矩阵不难想,但挺麻烦的... 时间复杂度\(O(Mlen2^kk^2+Mlen^3logn)\),Mlen最坏情况下为52. #include<cstdio> #include<cstring> #include<algori…

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…