【首先膜拜大湿】poj-2386-Lake Counting-DFS模板题

Lake Counting

Time Limit: 1000MS		Memory Limit: 65536K
Total Submissions: 16802		Accepted: 8523

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

题目如上：

ＡＣ代码如下：

#include<iostream>
#include<stdio.h>

#define Max 105
using namespace std;

char f[Max][Max];
int N ,M;
void DFS(int x,int y)
{
    f[x][y] = '.';
    for(int dx = -1; dx <= 1; dx++)
      for(int dy = -1; dy <= 1; dy++)
      {
          int nx, ny;
          nx = x + dx; ny = y + dy;
          if(nx < N&& ny < M&& nx >= 0&& ny >= 0&&f[nx][ny] == 'W') DFS(nx,ny);
      }

    return ;
}
int main()
{
    int res = 0,i,j;
    cin>>N;
    cin>>M;

    for(i = 0; i < N; i++)
          scanf("%s",&f[i]);

    for(int i = 0; i < N; i++)
      for(int j = 0; j < M; j++)
        if(f[i][j] == 'W')
        {
          DFS(i,j);
          res++;
        }
   printf("%d\n",res);
}


【存在的问题】1、脑残地把坐标轴坐标和矩阵的坐标对应起来了；

           2、解决了以上问题后程序还是在傲娇地RE，原来还是脑残地把“=”敲成“==”了；

            再后来程序还傲娇地WA了，于是           

           3、经大湿的指点把原输入

              for（i = 0; i < N; i++)

                for(j = 0; j < M; j++)

                   scanf("%c",&f[i][j]);

             换成了

               for（i = 0; i < N; i++)

                  scanf("%s", &f[i]);

              蓝后就AC了~~o(≧v≦)o~~

              原因就是%c输入把换行符给吃掉了~~蓝后造成了移位。。。。

              ORZ。。。。