poj2243Knight Moves寬搜

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#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;}