P1596 [USACO10OCT]湖计数Lake Counting

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  • 题目提供者 FarmerJohn2
  • 评测方式 云端评测
  • 标签 搜索 深度优先搜索,DFS USACO 2010
  • 难度 普及-
  • 时空限制 1000ms / 128MB

题解

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    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 <= 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.

    由于近期的降雨,雨水汇集在农民约翰的田地不同的地方。我们用一个NxM(1<=N<=100;1<=M<=100)网格图表示。每个网格中有水('W') 或是旱地('.')。一个网格与其周围的八个网格相连,而一组相连的网格视为一个水坑。约翰想弄清楚他的田地已经形成了多少水坑。给出约翰田地的示意图,确定当中有多少水坑。

    输入输出格式

    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.

    第1行:两个空格隔开的整数:N 和 M 第2行到第N+1行:每行M个字符,每个字符是'W'或'.',它们表示网格图中的一排。字符之间没有空格。

    输出格式:

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

    一行:水坑的数量

    输入输出样例

    输入样例#1: 复制
    10 12
    W........WW.
    .WWW.....WWW
    ....WW...WW.
    .........WW.
    .........W..
    ..W......W..
    .W.W.....WW.
    W.W.W.....W.
    .W.W......W.
    ..W.......W.
    
    输出样例#1: 复制
    3
    

    说明

    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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