多校赛3- Painter

D - Painter
Time Limit:1000MS Memory Limit:65536KB 64bit IO Format:%I64d & %I64u
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Status

Practice

HDU 5319
Appoint description:
Description
Mr. Hdu is an painter, as we all know, painters need ideas to innovate , one day, he got stuck in rut and the ideas dry up, he took out a drawing board and began to draw casually. Imagine the board is a rectangle, consists of several square grids. He drew diagonally, so there are two kinds of draws, one is like ‘\’ , the other is like ‘/’. In each draw he choose arbitrary number of grids to draw. He always drew the first kind in red color, and drew the other kind in blue color, when a grid is drew by both red and blue, it becomes green. A grid will never be drew by the same color more than one time. Now give you the ultimate state of the board, can you calculate the minimum time of draws to reach this state.

Input
The first line is an integer T describe the number of test cases.
Each test case begins with an integer number n describe the number of rows of the drawing board.
Then n lines of string consist of ‘R’ ‘B’ ‘G’ and ‘.’ of the same length. ‘.’ means the grid has not been drawn.
1<=n<=50
The number of column of the rectangle is also less than 50.
Output
Output an integer as described in the problem description.

Output
Output an integer as described in the problem description.

Sample Input
2
4
RR.B
.RG.
.BRR
B..R
4
RRBB
RGGB
BGGR
BBRR

Sample Output
3
6
此题比较坑

#include <iostream>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <cctype>
#include <string>
#include <map>
#include <queue>
#include <stack>
#include <list>
#include <algorithm>

using namespace std;

const int MAX = 110;

char s[MAX][MAX];

int len,n;

void DFS_R(int i,int j)
{
    if(i<0||i>=n||j<0||j>=len)
        return ;
    if(s[i][j]!='G'&&s[i][j]!='.'&&s[i][j]!='B')
    {
        s[i][j]='.';
        DFS_R(i+1,j+1);
        DFS_R(i-1,j-1);

    }
    else if(s[i][j]=='G')
    {
        s[i][j]='B';
        DFS_R(i+1,j+1);
        DFS_R(i-1,j-1);
    }
}
void DFS_B(int i,int j)
{
    if(i<0||i>=n||j<0||j>=len)
        return ;
    if(s[i][j]!='G'&&s[i][j]!='.'&&s[i][j]!='R')
    {
        s[i][j]='.';
        DFS_B(i-1,j+1);
        DFS_B(i+1,j-1);

    }
    else if(s[i][j]=='G')
    {
        s[i][j]='R';
        DFS_B(i-1,j+1);
        DFS_B(i+1,j-1);
    }
}

int main()
{
    int T;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        getchar();
        for(int i=0; i<n; i++)
        {
            scanf("%s",s[i]);

        }
        len=strlen(s[0]);
        int sum=0;
        for(int i=0; i<n; i++)
        {
            for(int j=0; j<len; j++)
            {
                if(s[i][j]!='.')
                {
                    if(s[i][j]=='B')
                    {
                        DFS_B(i,j);
                        sum++;
                    }
                    else if(s[i][j]=='R')
                    {
                        DFS_R(i,j);
                        sum++;
                    }
                    else
                    {
                        DFS_B(i,j);
                        DFS_R(i,j);
                        sum+=2;
                    }
                }
            }
        }
        printf("%d\n",sum);
    }
    return 0;
}