题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=648&page=show_problem&problem=5155 There are N guests checking in at the front desk of the hotel. 2K (0 ≤ 2K ≤ N) of them are twins.There are M room…

Hatsune Miku Problem's Link:   http://acm.hdu.edu.cn/showproblem.php?pid=5074 Mean: 有m种音符(note),现在要从这m种音符中选出n个来组成一首歌,相邻两个音符之间会有一个评分的方式,即score(i,j),而score(i,j)题目已经给出,现在要你按照题目的规定来选出n个音符来使得最终的分数最高. analyse: 鞍山赛区第二大水题,很简单的dp. 具体思路:dp[i][j]表示第i个音符选择的是第j种.…

题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=648&page=show_problem&problem=5150 题目大意:给一幅N个点M条边的无向图,有一些边,其中一部分只能涂红色,一部分只能涂黑色,一部分两种颜色都可以涂.现要求红色的边不超过K条的生成树个数模1e9+7的值. 思路:感谢昂神滋磁,贴链接:http://sd-invol…

题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=648&page=show_problem&problem=5153 In an infinite chess board, some pawns are placed on some cells.You have a rectangular bomb that is W width and H…

题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=648&page=show_problem&problem=5159 In normal football games, the winner team gets 3 points, loser team gets 0 point, and if there is a drawgame, bot…

题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=648&page=show_problem&problem=5151You have a rectangle of size N × M, N rows from top to bottom and M columns from left to right,that is divided int…

Long long ago there is a strong tribe living on the earth. They always have wars and eonquer others.One day, there is another tribe become their target. The strong tribe has decide to terminate them!!!There are m villages in the other tribe. Each vil…

题目链接:https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&category=648&page=show_problem&problem=5160 There is a tree with N nodes, and every node has a weighted value. A RIP (restricted increasing path)is a directe…

题意:有 n 个客人,m个房间,每个房间可住ci个人,这 n 个人中有 t 对双胞胎,sum{ci}  = n 问你有多少种住房方法. 析:计数DP,dp[i][j] 表示前 i 个房间,还剩下 j 对双胞胎未住,第 i+1 个房间,就从剩下的 j 对双胞胎中选 k 对,然后再从不是双胞胎的人选剩下的,每对先选一个,然后再从剩下的选全部的, 求组合数过程可能要用到逆元,可以提前打表. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000…

简单dp #include <stdio.h> #include <cstring> #include <iostream> #include <map> using namespace std; typedef unsigned long long ull; const int N = 105; int n, m, a[N]; int s[N][N], dp[2][N]; void pt(int x ){ for(int i = 1; i <= m;…