题目链接：这里哈哈~

#include<cstdio>
#include<iostream>
#include<cstring>

using namespace std;

int sx,sy,ex,ey,h,w;
int mp[30][30];

int minn(int x,int y)
{
    return x<y?x:y;
}

int dfs(int x,int y,int step)
{
    if(step>10)
        return 1000000;
    int i=1,ret=1000000;
    if(x+i<h && mp[x+i][y]!=1)
    {
        while(x+i<h && !mp[x+i][y])
            i++;
        if(x+i<h)
        {
            if(mp[x+i][y]==3)
                return step;
            int tmp=mp[x+i][y];
            mp[x+i][y]=0;
            ret=minn(ret,dfs(x+i-1,y,step+1));
            mp[x+i][y]=tmp;
        }
    }
    i=1;
    if(y+i<w && mp[x][y+i]!=1)
    {
        while(y+i<w && !mp[x][y+i])
            i++;
        if(y+i<w)
        {
            if(mp[x][y+i]==3)
                return step;
            int tmp=mp[x][y+i];
            mp[x][y+i]=0;
            ret=minn(ret,dfs(x,y+i-1,step+1));
            mp[x][y+i]=tmp;
        }
    }
    i=1;
    if(x-i>=0 && mp[x-i][y]!=1)
    {
        while(x-i>=0 && !mp[x-i][y])
            i++;
        if(x-i>=0)
        {
            if(mp[x-i][y]==3)
                return step;
            int tmp=mp[x-i][y];
            mp[x-i][y]=0;
            ret=minn(ret,dfs(x-i+1,y,step+1));
            mp[x-i][y]=tmp;
        }
    }
    i=1;
    if(y-i>=0 && mp[x][y-i]!=1)
    {
        while(y-i>=0 && !mp[x][y-i])
            i++;
        if(y-i>=0)
        {
            if(mp[x][y-i]==3)
                return step;
            int tmp=mp[x][y-i];
            mp[x][y-i]=0;
            ret=minn(ret,dfs(x,y-i+1,step+1));
            mp[x][y-i]=tmp;
        }
    }
    return ret;
}

int main()
{
    while(scanf("%d%d",&w,&h)!=EOF)
    {
        if(w==0 && h==0)
            break;
        memset(mp,0,sizeof(mp));
        for(int i=0;i<h;i++)
        {
            for(int j=0;j<w;j++)
            {
                scanf("%d",&mp[i][j]);
                if(mp[i][j]==2)
                {
                    sx=i;
                    sy=j;
                    mp[i][j]=0;
                }
                if(mp[i][j]==3)
                {
                    ex=i;
                    ey=j;
                }
            }
        }
        int ans=dfs(sx,sy,1);
        if(ans!=1000000)
            printf("%d\n",ans);
        else printf("-1\n");
    }
    return 0;
}

/*

18 2
1 1 0 1 0 1 1 0 1 0 0 3 0 0 1 0 1 0
0 0 0 1 0 1 0 1 1 2 1 1 0 1 0 0 1 0

-1

14 6
0 0 1 0 0 0 0 1 1 0 1 1 1 0
0 0 1 0 1 0 1 1 1 1 1 1 1 1
1 1 0 2 1 1 0 0 1 0 0 0 0 1
1 0 1 1 1 1 1 1 1 1 1 1 1 0
1 0 1 1 1 0 1 1 0 1 1 0 0 0
1 0 1 0 0 1 0 0 1 0 0 0 0 3

-1
*/

POJ 3009 Curling 2.0 (DFS)