poj2243Knight Moves宽搜

#include<stdio.h>
#include<iostream>
#include<string.h>
#include<queue>
#include<stack>
#include<list>
#include<stdlib.h>
#include<algorithm>
#include<vector>
#include<map>
#include<set>
using namespace std;
int dx[]={-2,-1,1,2,-2,-1,1,2};
int dy[]={1,2,2,1,-1,-2,-2,-1};
int vis[10][10];
char str[100],str1[100];
int a,b,c,d;
int dist[10000];
void bfs(int x,int y)
{
    int cc=x*10+y;
    queue<int> q;
    q.push(cc);
    while(!q.empty()){
        int cc=q.front();
        q.pop();
        int xx=cc/10;int yy=cc%10;
        if(xx==c&&yy==d){
            printf("To get from %s to %s takes %d knight moves.\n",str,str1,dist[cc]);
            return ;
        }
        for(int i=0;i<8;i++){
            int x1=xx+dx[i];int y1=yy+dy[i];
            if(x1>=1&&x1<=8&&y1>=1&&y1<=8&&!vis[x1][y1]){
                int k=x1*10+y1;
                dist[k]=dist[cc]+1;
                q.push(k);
                vis[x1][y1]=1;
            }
        }
    }
}
int main()
{
    while(cin>>str>>str1){
        memset(dist,0,sizeof(dist));
        memset(vis,0,sizeof(vis));
        a=str[0]-'a'+1;b=str[1]-'0';
        c=str1[0]-'a'+1;d=str1[1]-'0';
        bfs(a,b);
    }
    return 0;
}