[Usaco2005 qua]Lake Counting

题目描述

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 <= 1="" n="" <="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="" connected="" set="" of="" squares="" with="" them,="" where="" considered="" adjacent="" all="" eight="" its="" neighbors.="" given="" diagram="" john's="" field,="" determine="" he="" has.="" p="">

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输入格式

* 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.

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输出格式

* Line 1: The number of ponds in Farmer John's field.

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样例输入

10 12
W........WW.
.WWW.....WWW
....WW...WW.
.........WW.
.........W..
..W......W..
.W.W.....WW.
W.W.W.....W.
.W.W......W.
..W.......W.

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样例输出

3

OUTPUT DETAILS:

There are three ponds: one in the upper left, one in the lower left,
and one along the right side.

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提示

没有写明提示

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题目来源

Gold