bzoj1751 [Usaco2005 qua]Lake Counting

bfs找出联通块个数就好了

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define fo(i,a,b) for(int i=a;i<=b;i++)
#define fd(i,a,b) for(int i=a;i>=b;i--)
using namespace std;
const int N=105;
int n,m,ans;
const int dx[8]={-1,-1,-1,1,1,1,0,0};
const int dy[8]={-1,0,1,-1,0,1,1,-1};
char s[N][N];
struct node
{int x,y;
}q[N*N];
bool vis[N][N];
inline void bfs(int x,int y)
{vis[x][y]=1;int t=0,w=1;q[1].x=x;q[1].y=y;while (t<w){t++;fo(k,0,7){int x1=q[t].x+dx[k];int y1=q[t].y+dy[k];if (x1>=1&&x1<=n&&y1>=1&&y1<=m&&!vis[x1][y1]&&s[x1][y1]=='W'){vis[x1][y1]=1;q[++w].x=x1;q[w].y=y1;}}}
}
int main()
{scanf("%d%d",&n,&m);fo(i,1,n){scanf("%s",s[i]+1);}fo(i,1,n)fo(j,1,m)if (s[i][j]=='W'&&!vis[i][j]){bfs(i,j);ans++;}printf("%d\n",ans);
}

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