A - Oil Deposits

A - Oil Deposits

Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u

Submit  Status

Description

The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large rectangular region of land at a time, and creates a grid that divides the land into numerous square plots. It then analyzes each plot separately, using sensing equipment to determine whether or not the plot contains oil. A plot containing oil is called a pocket. If two pockets are adjacent, then they are part of the same oil deposit. Oil deposits can be quite large and may contain numerous pockets. Your job is to determine how many different oil deposits are contained in a grid. 

 

Input

The input file contains one or more grids. Each grid begins with a line containing m and n, the number of rows and columns in the grid, separated by a single space. If m = 0 it signals the end of the input; otherwise 1 <= m <= 100 and 1 <= n <= 100. Following this are m lines of n characters each (not counting the end-of-line characters). Each character corresponds to one plot, and is either `*', representing the absence of oil, or `@', representing an oil pocket. 

 

Output

For each grid, output the number of distinct oil deposits. Two different pockets are part of the same oil deposit if they are adjacent horizontally, vertically, or diagonally. An oil deposit will not contain more than 100 pockets. 

 

Sample Input

1 1 * 3 5 *@*@* **@** *@*@* 1 8 @@****@* 5 5 ****@ *@@*@ *@**@ @@@*@ @@**@ 0 0

 

Sample Output

0 1 2 2

这个题用了打破传统的规律，用了简单的递归依次循环进行 逐步深搜，每次返回到周围的没找过的数进行深搜，类似于广搜中的栈的操作，与广搜有着惊人的相似。

这个题在写时由于习惯将scanf写成printf.,导致找了好长的时间。

#include
#include
#include
using namespace std;
const int maxv=100;
int vis[maxv][maxv];
char g[maxv][maxv];
int n,m;
void dfs(int x,int y)
{
if(x<0||y<0||x>=n||y>=m)
return;
if((g[x][y]!='@')||vis[x][y]==1)
return;
vis[x][y]=1;
for(int i=-1;i<2;i++)
for(int j=-1;j<2;j++)
if(i!=0||j!=0)
dfs(i+x,j+y);
}
int main()
{
while(scanf("%d%d",&n,&m)!=EOF)
{
if(n==0)
break;
   getchar();
  
memset(vis,0,sizeof(vis));
for(int i=0;i {
scanf("%s",g[i]);
}

int cout=0;
for(int i=0;i {
for(int j=0;j {
if((g[i][j]=='@')&&vis[i][j]==0)
{
dfs(i,j);
cout++;
}

}
}

   printf("%d\n",cout);
}
return 0;
}