HDU 1241 Oil Deposits (DFS)
2014-04-05 16:40
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Oil Deposits
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 10485 Accepted Submission(s): 6090
Problem 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
题目意思就是找油块,给了一张地图,@表示油,连在一起的油属于同一个块,这种连在一起包括水平和斜着连接。统计出地图中总的油块数,使用dfs直接解决就可以。注意八个方向的搜索,以及便捷处理就ok了。
#include <cstdio> #include <cstdlib> #include <cstring> const int MAX = 102; char grid[MAX][MAX]; int visit[MAX][MAX]; int cnt,n,m,tc; void dfs(int x,int y){ if(x<0 || x>=n || y<0 || y>=m)return; if(visit[x][y]==1)return; if(grid[x][y]=='*')return; visit[x][y] = 1; ++tc; dfs(x-1,y);//向八个方向搜索 dfs(x+1,y); dfs(x,y-1); dfs(x,y+1); dfs(x-1,y-1); dfs(x+1,y+1); dfs(x-1,y+1); dfs(x+1,y-1); } int main(){ //freopen("in.txt","r",stdin); int i,j; while(scanf("%d %d%*c",&n,&m)!=EOF && m){ cnt = 0; memset(visit,0,sizeof(visit)); for(i=0;i<n;++i){ scanf("%s",grid[i]); } for(i=0;i<n;++i){ for(j=0;j<m;++j){ tc = 0; dfs(i,j); if(tc>=1)++cnt; } } printf("%d\n",cnt); } return 0; }
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