hdu 1035

地址：http://acm.hdu.edu.cn/showproblem.php?pid=1035

题意：看小人是否能走出迷宫。

mark:wa了一次，又是循环跳出条件出问题了……

代码：

#include <stdio.h>
#include <string.h>

int main()
{
    char a[15][15];
    int m,n,s,sum,b[15][15];
    int i,j,k;
    while(scanf("%d%d", &m, &n), m+n)
    {
        scanf("%d", &s);
        for(i = 0; i < m; i++)
            scanf("%s", a[i]);
        memset(b, 0, sizeof(b));
        i = 0;
        sum = 1;
        j = s-1;
        b[i][j] = 1;
        while(1)
        {
            if(a[i][j] == 'N') i--;
            else if(a[i][j] == 'E') j++;
            else if(a[i][j] == 'W') j--;
            else if(a[i][j] == 'S') i++;
            sum++;
            if(i >= 0 && i < m && j >= 0 && j < n)
            {
                if(b[i][j]) {printf("%d step(s) before a loop of %d step(s)\n", b[i][j]-1, sum-b[i][j]);break;}
                else b[i][j] = sum;
            }
            else {printf("%d step(s) to exit\n", sum-1);break;}
        }
    }
    return 0;
}