Description Misha trains several ACM teams at the university. He is an experienced coach, and he does not underestimate the meaning of friendly and collaborative atmosphere during training sessions. It used to be that way, but one of the teams happen…

题意:给出n对点a,b  要求从没对点中选出一个,且最终选出的点n个数不能存在相同的.输入数据满足每种数最多出现3次,最少出现1次 思路:第i对点的编号2*i, 2*i+1,   因为每个数最多出现3次,那么完全可以枚举每个数,然后相同的数之间的编号建立关系(¬a Λ ¬b 为真,表示这两个编号不能同时选), 然后同一对的俩编号之间也有关系(a xor b为真,代表a和b必须选且只能选一个,a xor b 可以写成 (a V b) Λ (¬a V ¬b)),这样跑完twosat就能得到一个满足情…

Misha trains several ACM teams at the university. He is an experienced coach, and he does not underestimate the meaning of friendly and collaborative atmosphere during training sessions. It used to be that way, but one of the teams happened to win co…

URAL 2078~2089 A - Bowling game 题目描述:给出保龄球每一局击倒的球数,按照保龄球的规则,算出总得分的最小值和最大值. solution 首先是最小值:每一局第一球击倒\(0\)个,第二球击倒给定的数目,最后一局比较特殊,如果最后一局得分超过\(20\),最后一局只能是\(10, 10, ?\),否则第一球可以击倒\(0\)个. 然后是最大值:每一局击倒给定的数目,最后一局的击球数往前靠. 然后按规则算分即可. 时间复杂度:\(O(10)\) C - Wallet…

唔 神题一道 大家感受一下 1873. GOV Chronicles Time limit: 0.5 secondMemory limit: 64 MB A chilly autumn night. Well wrapped up in a coat, a man is rapidly walking along a gray street. This is the Tradition Keeper of the ACM club in Ural State University. Drizzl…

http://acm.hdu.edu.cn/showproblem.php?pid=2089 数位dp,参照了打野的博客 预处理出f数组,f[i][j]表示第i位为数字j时的可行的数字总数. 对于区间[l,r],可以用区间[1,r]-[1,l)求得. #include<cstdio> #include<cstring> #include<algorithm> using namespace std; int in() { int k = 0, fh = 1; char…

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…