标签:map John .. int Lake WW POJ Farmer Counting
Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contains either water ('W') or dry land ('.'). Farmer John would like to figure out how many ponds have formed in his field. A pond is a connected set of squares with water in them, where a square is considered adjacent to all eight of its neighbors.
Given a diagram of Farmer John's field, determine how many ponds he has.
Input
* Line 1: Two space-separated integers: N and M
* Lines 2..N+1: M characters per line representing one row of Farmer John's field. Each character is either 'W' or '.'. The characters do not have spaces between them.
Output
* Line 1: The number of ponds in Farmer John’s field.
Sample Input
10 12
W........WW.
.WWW.....WWW
....WW...WW.
.........WW.
.........W..
..W......W..
.W.W.....WW.
W.W.W.....W.
.W.W......W.
..W.......W.
Sample Output
3
Hint
OUTPUT DETAILS:
There are three ponds: one in the upper left, one in the lower left,and one along the right side.
AC代码:
//poj-2386-Lake counting(八连通)
#include<iostream>
#include<cstdio>
using namespace std;
#define N 100
int n,m;
char map[N][N];
void dfs(int x,int y){
map[x][y]='.';
for(int dx=-1;dx<=1;dx++)
for(int dy=-1;dy<=1;dy++)
{
int nx=dx+x;
int ny=dy+y;
if(nx>=0&&nx<n&&ny>=0&&ny<m&&map[nx][ny]=='W')
dfs(nx,ny);
}
return;
}
int main(){
scanf("%d%d",&n,&m);
int ans=0;
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
cin>>map[i][j];
for(int i=0;i<n;i++)
for(int j=0;j<m;j++)
{
if(map[i][j]=='W'){
dfs(i,j);
ans++; //遍历一遍,计算加一
}
}
printf("%d\n",ans);
return 0;
}
标签:map,John,..,int,Lake,WW,POJ,Farmer,Counting 来源: https://blog.csdn.net/ljxzuishuai/article/details/96704622
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