Cannon Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=4499 Description In Chinese Chess, there is one kind of powerful chessmen called Cannon. It can move horizontally or vertically along the chess grid. At eac…

题目链接:hdu 4499 Cannon 题目大意:给出一个n*m的棋盘,上面已经存在了k个棋子,给出棋子的位置,然后求能够在这种棋盘上放多少个炮,要求后放置上去的炮相互之间不能攻击. 解题思路:枚举行放的情况,用二进制数表示,每次放之前推断能否放下(会不会和已经存在的棋子冲突),放下后推断会不会互相攻击的炮,仅仅须要对每一个新加入的炮考虑左边以及上边就能够了. #include <cstdio> #include <cstring> #include <algorithm&…

Cannon Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 965    Accepted Submission(s): 556 Problem Description In Chinese Chess, there is one kind of powerful chessmen called Cannon. It can move…

Cannon Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 21    Accepted Submission(s): 14 Problem Description In Chinese Chess, there is one kind of powerful chessmen called Cannon. It can move ho…

题意:给定一个n*m个棋盘,放上一些棋子,问你最多能放几个炮(中国象棋中的炮). 析:其实很简单,因为棋盘才是5*5最大,那么直接暴力就行,可以看成一行,很水,时间很短,才62ms. 代码如下: #include <cstdio> #include <string> #include <cstdlib> #include <cmath> #include <iostream> #include <cstring> #include &…

题意:在n*m的方格里有t个棋子,问最多能放多少个炮且每一个炮不能互相攻击(炮吃炮) 炮吃炮:在同一行或同一列且中间有一颗棋子. #include <stdio.h> #include <iostream> #include <algorithm> #include <string.h> #include <queue> #include <math.h> #define M 50 #define LL long long using…

HDU.5692 Snacks ( DFS序 线段树维护最大值 ) 题意分析 给出一颗树,节点标号为0-n,每个节点有一定权值,并且规定0号为根节点.有两种操作:操作一为询问,给出一个节点x,求从0号节点开始到x节点,所能经过的路径的权值最大为多少:操作二为修改,给出一个节点x和值val,将x的权值改为val. 可以看出是树上修改问题.考虑的解题方式有DFS序+线段树,树链剖分,CXTree.由于后两种目前还不会,选择用DFS序来解决. 首先对树求DFS序,在求解过程当中,顺便求解树上前缀和(p…

题目链接 http://acm.hdu.edu.cn/showproblem.php?pid=5091 Problem Description Recently, the γ galaxies broke out Star Wars. Each planet is warring for resources. In the Star Wars, Planet X is under attack by other planets. Now, a large wave of enemy spaces…

Necklace/center> 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5727 Description SJX has 2*N magic gems. N of them have Yin energy inside while others have Yang energy. SJX wants to make a necklace with these magic gems for his beloved BHB. To avoid…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1175 解题思路:从出发点开始DFS.出发点与终点中间只能通过0相连,或者直接相连,判断能否找出这样的路径. #include<cmath> #include<cstdio> #include<cstring> #include<iostream> #include<algorithm> using namespace std; #define N 1…