[题意] 这个题目就是问,是否存在每个人对应每一种颜色,如果存在则输出字典序最小的. 否则输出-1 [题解] 利用next_permutation来构造36种情况.记住最后还需要排序一遍. 然后用子序列判断是否存在.while写即可. #include<bits/stdc++.h> using namespace std; ] ; ] ; ] = {"Alice","Bob","Yazid"}; ] = {"alice&qu…

怎么也没想到是子集DP,想到了应该就没什么难度了. 首先n>21时必定为NO. g[i][j]表示位置i后的第一个字母j在哪个位置,n*21求出. f[S]表示S的所有全排列子序列出现的最后末尾位置,枚举最后一个字母转移.21*2^21 #include<cstdio> #include<cstring> #include<algorithm> #define rep(i,l,r) for (int i=(l); i<=(r); i++) using nam…

1045 Favorite Color Stripe (30 分)   Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off those unwanted pieces and sewing the remaining parts together to f…

十分感谢GXZ大佬的讲解,此处致以敬意!emmmm在初学状压DP时就理解了如此精妙的一道题,感到很开森~ \(Address\) ________________ #\(\color{red}{\mathcal{Description}}\) 现在有一个长度为n的随机排列,求它的最长上升子序列长度的期望. 为了避免精度误差,你只需要输出答案模998244353的余数. #\(\color{red}{\mathcal{Solution}}\) 那么这道题,作为一道显然不是那么可做的题,我们首先来讲…

一.开篇 既上一篇<交换法生成全排列及其应用> 后,这里讲的是基于全排列 (Permutation)本身的一些问题,包括:求下一个全排列(Next Permutation):求指定位置的全排列(Permutation Sequence):给出一个全排列,求其所在位置. 二.例题 1. 求下一个全排列,Next permuation Implement next permutation, which rearranges numbers into the lexicographically ne…

LeetCode:60. Permutation Sequence,n全排列的第k个子列 : 题目: LeetCode:60. Permutation Sequence 描述: The set [1,2,3,-,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for…

Color the Ball Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 48 Accepted Submission(s): 25   Problem Description There are infinite balls in a line (numbered 1 2 3 ....), and initially all of th…

题目如下: Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off those unwanted pieces and sewing the remaining parts together to form her favorite color stripe.…

https://pintia.cn/problem-sets/994805342720868352/problems/994805437411475456 Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off those unwanted pieces an…

1045 Favorite Color Stripe 1045. Favorite Color Stripe (30)Eva is trying to make her own color stripe out of a given one. She would like to keep only her favorite colors in her favorite order by cutting off those unwanted pieces and sewing the remain…