uva-784-水题-搜索

题意:从*点开始,标记所有能走到的点,X代表墙,下划线原样输出

AC：40ms

#include<stdio.h>
#include<iostream>
#include<queue>
#include<memory.h>
using namespace std;
struct DIR
{
	int r;
	int c;
} dir[] = { { -1, 0 }, { 1, 0 }, { 0, -1 }, { 0, 1 } };
const int MAXR = 31;
const int MAXC = 81;
void bfs(queue<DIR> q, int maps[][MAXC])
{
	DIR d;
	while (!q.empty())
	{
		d = q.front();
		q.pop();
		int nr, nc;
		for(int i = 0; i < 4; i++)
		{
			nr = d.r + dir[i].r;
			nc = d.c + dir[i].c;
			if(maps[nr][nc] != 1)
				continue;
			maps[nr][nc] = 2;
			DIR dd;
			dd.r = nr;
			dd.c = nc;
			q.push(dd);
		}
	}

}
int main()
{
	freopen("d:\1.txt", "r", stdin);
	int n;
	cin >> n;
	getchar();
	while (n--)
	{
		int r = 0, c = 0;
		char cc;
		int maps[MAXR][MAXC];
		int sr, sc;
		memset(maps, 0, sizeof(maps));
		string str;
		//getline(cin, str);
		while (getline(cin, str))
		{
			if(str.at(0) == '_')
				break;
			int length = str.length();
			if(length > c)
				c = length;
			for(int i = 0; i < length; i++)
			{
				cc = str.at(i);
				if(cc == ' ' || cc == '*')
				{
					maps[r][i] = 1;
				}
				if(cc == '*')
				{
					sr = r;
					sc = i;
				}
				if(cc == 'X')
				{
					maps[r][i] = -1;
				}
			}
			r++;
		}
		DIR d;
		d.r = sr;
		d.c = sc;
		queue<DIR> q;
		q.push(d);
		bfs(q, maps);
		for(int i = 0; i < r; i++)
		{
			for(int j = 0; j < c; j++)
			{
				if(maps[i][j] == 0)
					break;
				if(maps[i][j] == -1)
					cout << 'X';
				if(maps[i][j] == 2)
					cout << '#';
				if(maps[i][j] == 1)
					cout << ' ';
			}
			cout << endl;
		}
		cout << str << endl;
	}
	return 0;
}