不想打题面了,题面戳这里 这道题目的模型转换地有点猛.首先我们肯定需要让老板把那些不相邻的人的卡牌放在前面,这样他们就作废了.然后剩下的卡牌就都是相邻人之间的了.我们就可以把这个序列分成若干个联通块,每个联通块内相邻的人之间有连边.此时显然不同联通块是互不干扰的,我们只需要知道每个联通块内剩下的人最多可以是多少就可以了.这个我们就可以dp了. \(f_i\)表示大小为\(i\)的联通块内最多能剩多少人,那么方程就和显然了. \[f_i = \max \{ f_j+f_{i-j-1} \},j <…

朴素动态规划 ZOJ3161 题意:(严重标题党)老板不想让客人走,客人不想留,客人按顺序排好,老板抽8g(书上翻译成八卦,神翻译),抽到的 如果相邻,其中一个人由客人决定离开,求最后黑心的老板最多能让多少人留下. 输入: n(客人个数),m(8g关系对数) a(客人a),b(客人b)(m行) 输出: T(最多留下的人数) 思路:之前看题目的时候看懂了,但压根想不出来怎么用dp做,因为我考虑到既然老板要求最多人,而且走人的时候又由客人来选择谁走,那么情况应该很复杂(后来证明我想多了),书上的算法…

题目地址:1021. Couples 思路: 想清楚了这道题其实很简单.利用夫妻出现的位置作为下标,并设为同一值,第一对夫妻值为1,第二对为2,以此类推,存储完毕即可进入下一步. 利用栈这个数据结构:遍历这个数组,当栈不为空且栈顶元素等于数组出现的元素时,pop掉栈顶元素,其余情况则入栈.循环完毕,若栈为空则为Yes,否则为No. 具体代码如下: #include <iostream> #include <stack> using namespace std; int main()…

N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side by side. A swap consists of choosing any two people, then they stand up and switch seats. The people…

N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side by side. A swapconsists of choosing any two people, then they stand up and switch seats. The people a…

[CC-COUPLES]Couples sit next to each other 题目大意: 有\(n(n\le5\times10^5)\)对小伙伴共\(2n\)个人坐成一圈.刚开始编号为\(i\)的人坐在第\(i\)个座位上.每次可以让相邻的两个人交换座位.问要让每一对小伙伴的座位都相邻至少需要多少次交换? 思路: 答案为每一对两个人距离之和-"交叉"的小伙伴的对数.树状数组维护即可. 时间复杂度\(\mathcal O(n\log n)\). 源代码: #include<…

When marriage therapist Sharon Gilchrest O'Neill met with new clients recently, she asked them why they were seeking therapy. The couple told her they'd spent years arguing over finances and recently had their worst-ever blowup. The husband complaine…

Damn Couples Time Limit: 1 Second      Memory Limit: 32768 KB As mentioned in the problem "Couples", so many new words appear on the internet. Another special one is "Damn Couples", a club which consists of people who have failed on lo…

N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side by side. A swap consists of choosing any two people, then they stand up and switch seats. The people…

N couples sit in 2N seats arranged in a row and want to hold hands. We want to know the minimum number of swaps so that every couple is sitting side by side. A swap consists of choosing any two people, then they stand up and switch seats. The people…