Lake Counting
| Time Limit: 1000MS |
|
Memory Limit: 65536K |
| Total Submissions: 20003 |
|
Accepted: 10063 |
Description
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.
题目分析：
给出一块字符串区域代表地图，W代表water（水），其余代表土地，水的连接代表 湖，要我们计算这个地图里有几个湖。
算法分析：注意用读入字符串的。。。未完待续！
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
char map[101][101];
int vt[101][101];
int dir[8][2] = {{0, -1}, {0, 1}, {-1, 0}, {1, 0}, {1, 1}, {1, -1}, {-1, 1}, {-1, -1}};
int n, m;
void dfs(int x, int y)
{
int i;
for(i=0; i<8; i++)
{
int xx = x + dir[i][0];
int yy = y + dir[i][1];
if(map[xx][yy]==‘W‘ && xx>=0 && xx<m && yy>=0 && yy<n && vt[xx][yy]==0 )
{
vt[xx][yy] = 1;
dfs(xx, yy);
}
}
}
int main()
{
int cnt;
int i, j;
while(scanf("%d %d%*c", &m, &n)!=EOF)
{
if(m==0 && n==0)
break;
cnt = 0;
memset(vt, 0, sizeof(vt));
for(i=0; i<m; i++)
{
scanf("%s", map[i]);
}
for(i=0; i<m; i++)
{
for(j=0; j<n; j++)
{
if(map[i][j]==‘W‘ && vt[i][j]==0)
{
vt[i][j] = 1;
cnt++;
dfs(i, j);
}
}
}
printf("%d\n", cnt);
}
return 0;
}
POJ 之2386 Lake Counting,布布扣,bubuko.com
POJ 之2386 Lake Counting
原文：http://www.cnblogs.com/yspworld/p/3871980.html
