[USACO10OCT]湖计数Lake Counting 联通块

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

说明

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

#include<iostream>

#include<cstdio>

#include<algorithm>

#include<cstdlib>

#include<cstring>

#include<string>

#include<cmath>

#include<map>

#include<set>

#include<vector>

#include<queue>

#include<bitset>

#include<ctime>

#include<deque>

#include<stack>

#include<functional>

#include<sstream>

//#include<cctype>

//#pragma GCC optimize(2)

using namespace std;

#define maxn 1000005

#define inf 0x7fffffff

//#define INF 1e18

#define rdint(x) scanf("%d",&x)

#define rdllt(x) scanf("%lld",&x)

#define rdult(x) scanf("%lu",&x)

#define rdlf(x) scanf("%lf",&x)

#define rdstr(x) scanf("%s",x)

typedef long long  ll;

typedef unsigned long long ull;

typedef unsigned int U;

#define ms(x) memset((x),0,sizeof(x))

const long long int mod = 1e9 + 7;

#define Mod 1000000000

#define sq(x) (x)*(x)

#define eps 1e-4

typedef pair<int, int> pii;

#define pi acos(-1.0)

//const int N = 1005;

#define REP(i,n) for(int i=0;i<(n);i++)

typedef pair<int, int> pii;

inline ll rd() {

	ll x = 0;

	char c = getchar();

	bool f = false;

	while (!isdigit(c)) {

		if (c == '-') f = true;

		c = getchar();

	}

	while (isdigit(c)) {

		x = (x << 1) + (x << 3) + (c ^ 48);

		c = getchar();

	}

	return f ? -x : x;

}

ll gcd(ll a, ll b) {

	return b == 0 ? a : gcd(b, a%b);

}

int sqr(int x) { return x * x; }

/*ll ans;

ll exgcd(ll a, ll b, ll &x, ll &y) {

	if (!b) {

		x = 1; y = 0; return a;

	}

	ans = exgcd(b, a%b, x, y);

	ll t = x; x = y; y = t - a / b * y;

	return ans;

}

*/

int n, m;

char ch[200][200];

int tot;

int a[200][200];

bool vis[200][200];

int dx[] = { 1,1,1,-1,-1,-1,0,0 };

int dy[] = { 0,1,-1,0,1,-1,1,-1 };

void dfs(int x, int y,int id) {

	vis[x][y] = id;

	for (int i = 0; i < 8; i++) {

		int nx = x + dx[i];

		int ny = y + dy[i];

		if (!vis[nx][ny] && a[nx][ny] == 1) {

			dfs(nx, ny, id);

		}

	}

}

int main() {

	//ios::sync_with_stdio(0);

	rdint(n); rdint(m);

	for (int i = 1; i <= n; i++)scanf("%s", ch[i] + 1);

	for (int i = 1; i <= n; i++)

		for (int j = 1; j <= m; j++)

			if (ch[i][j] == 'W')a[i][j] = 1;

	for (int i = 1; i <= n; i++) {

		for (int j = 1; j <= m; j++) {

			if (a[i][j] == 1 && !vis[i][j]) {

				dfs(i, j, ++tot);

			}

		}

	}

	cout << tot << endl;

	return 0;

}

巴特西

[USACO10OCT]湖计数Lake Counting 联通块

题目描述

输入输出格式

输入输出样例

说明

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