Lake Counting
Time Limit: 1000MS  Memory Limit: 65536K  

Total Submissions: 59523  Accepted: 28958 
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 spaceseparated 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
1  10 12 
Sample Output
1  3 
Hint
OUTPUT DETAILS:
There are three ponds: one in the upper left, one in the lower left,and one along the right side.
Source
题目大意: 计算出相连的’W’有多少块
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