zoj 2975

Kinds of Fuwas

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Time Limit: 2 Seconds      Memory Limit: 65536 KB

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In the year 2008, the 29th Olympic Games will be held in Beijing. This will signify the prosperity of China as well as becoming a festival for people all over the world.

The official mascots of Beijing 2008 Olympic Games are Fuwa, which are named as Beibei, Jingjing, Haunhuan, Yingying and Nini. Fuwa embodies the natural characteristics of the four most popular animals in China -- Fish, Panda, Tibetan Antelope, Swallow -- and the Olympic Flame. To popularize the official mascots of Beijing 2008 Olympic Games, some volunteers make a PC game with Fuwa.

As shown in the picture, the game has a matrix of Fuwa. The player is to find out all the rectangles whose four corners have the same kind of Fuwa. You should make a program to help the player calculate how many such rectangles exist in the Fuwa matrix.

Input

Standard input will contain multiple test cases. The first line of the input is a single integer T (1 <= T <= 50) which is the number of test cases. And it will be followed by T consecutive test cases.

The first line of each test case has two integers M and N (1 <= M, N <= 250), which means the number of rows and columns of the Fuwa matrix. And then there are M lines, each has N characters, denote the matrix. The characters -- 'B' 'J' 'H' 'Y' 'N' -- each denotes one kind of Fuwa.

Output

Results should be directed to standard output. The output of each test case should be a single integer in one line, which is the number of the rectangles whose four corners have the same kind of Fuwa.

Sample Input

2
2 2
BB
BB
5 6
BJHYNB
BHBYYH
BNBYNN
JNBYNN
BHBYYH

Sample Output

1
8

题意：给定一个n*m的矩阵，由字母组成其仅含有五个字母。问四个角上字母相同的矩阵有多少个。

思路：开始的时候没有什么好的想法，只是认为四个for解决来着，但是很必然的就TLE了。然后听队长说了一个思路，先两行之间判断相等的就+1，然后进行组合就OK了（任意选取两个）。

#include<iostream>
#include<stdio.h>
#include<string.h>
using namespace std;
char str[]={"BJHYN"};
char map[300][300];
int sum,n,m,ans;
int main()
{
    int cas;
    cin>>cas;
    while(cas--)
    {
        sum=0;
        cin>>n>>m;
        for(int i=0;i<n;i++)
        for(int j=0;j<m;j++)
        cin>>map[i][j];
        for(int i=0;i<n;i++)
        for(int j=i+1;j<n;j++)
        {
            for(int k=0;k<5;k++)
            {
                ans=0;
                for(int l=0;l<m;l++)
                if(map[i][l]==str[k]&&map[j][l]==str[k])
                ans+=1;
                sum+=ans*(ans-1)/2;
            }
        }
        cout<<sum<<endl;
    }
    return 0;
}