POJ 1979 Red and Black 四方向棋盘搜索
Red and Black
Time Limit: 1000MS | Memory Limit: 30000K | |
Total Submissions: 50913 | Accepted: 27001 |
Description
Write a program to count the number of black tiles which he can reach by repeating the moves described above.
Input
input consists of multiple data sets. A data set starts with a line
containing two positive integers W and H; W and H are the numbers of
tiles in the x- and y- directions, respectively. W and H are not more
than 20.
There are H more lines in the data set, each of which includes W
characters. Each character represents the color of a tile as follows.
'.' - a black tile
'#' - a red tile
'@' - a man on a black tile(appears exactly once in a data set)
The end of the input is indicated by a line consisting of two zeros.
Output
each data set, your program should output a line which contains the
number of tiles he can reach from the initial tile (including itself).
Sample Input
6 9
....#.
.....#
......
......
......
......
......
#@...#
.#..#.
11 9
.#.........
.#.#######.
.#.#.....#.
.#.#.###.#.
.#.#..@#.#.
.#.#####.#.
.#.......#.
.#########.
...........
11 6
..#..#..#..
..#..#..#..
..#..#..###
..#..#..#@.
..#..#..#..
..#..#..#..
7 7
..#.#..
..#.#..
###.###
...@...
###.###
..#.#..
..#.#..
0 0
Sample Output
45
59
6
13 题意:@是搜索起点,#不能走,.可以走,.走过一次后会变为#,问从@开始在棋盘上一共可以走几步(@起点算一步)
#include<iostream>
#include<string.h>
#include<string>
#include<algorithm>
using namespace std;
int dir[][]={{,-},{,},{,},{-,}};
string a[];
int n,m,cnt;
int check(int x,int y)
{
if(x>=&&x<n&&y>=&&y<m&&a[x][y]!='#')
return ;
else
return ;
}
void dfs(int x,int y)
{
if(check(x,y)==)
return ;
else
{
a[x][y]='#';
cnt++;
for(int i=;i<;i++)
{
int dx,dy;
dx=x+dir[i][];
dy=y+dir[i][];
dfs(dx,dy);
}
}
}
int main()
{
while(cin>>m>>n&&n&&m)
{
for(int i=;i<n;i++)
cin>>a[i];
cnt=;
for(int i=;i<n;i++)
{
for(int j=;j<m;j++)
{
if(a[i][j]=='@')
{
dfs(i,j);
break;
}
}
}
cout<<cnt<<endl;
}
return ;
}
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