hdu 1241 Oil Deposits 【DFS】
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题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1241
题意:油田问题,很经典的搜索题
解析:每遇到@就对他进行dfs,把和他相连的@全都打上标记,顺便ans++
#include <iostream>#include <cstdio>#include <cstring>#include <algorithm>#include <cmath>#include <queue>using namespace std;int dx[] = {0,1,-1,0,1,-1,1,-1};int dy[] = {1,0,0,-1,-1,1,1,-1};char a[105][105];int n,m;int vis[105][105];void dfs(int x,int y){ for(int i=0;i<8;i++) { int tx = x+dx[i]; int ty = y+dy[i]; if(vis[tx][ty] || a[tx][ty]=='*') continue; if(tx<0 || tx>=n || ty<0 || ty>=m) continue; vis[tx][ty] = 1; dfs(tx,ty); } return ;}int main(){ while(~scanf("%d %d",&n,&m)) { if(n==0 && m==0) break; for(int i=0;i<n;i++) scanf("%s",a[i]); memset(vis,0,sizeof(vis)); int ans = 0; for(int i=0;i<n;i++) { for(int j=0;j<m;j++) { if(a[i][j]=='@' && !vis[i][j]) { vis[i][j] = 1; dfs(i,j); ans++; } } } printf("%d\n",ans); } return 0;}
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