hihoCoder搜索二·骑士问题

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <algorithm>
#include <iostream>
using namespace std;
#define LL __int64
#define mod 9973
#define N 100010

int ma[10][10];
int f1[10][10];
int f2[10][10];
int f3[10][10];

struct asd{
    int x,y;
    int step;
};
asd q[N];
int head,tail;
int dx[8]={-2,-2,-1,-1,1,1,2,2};
int dy[8]={1,-1,2,-2,2,-2,1,-1};

void bfs1(int x,int y)
{
    memset(f1,-1,sizeof(f1));
    head=0;
    tail=1;
    q[head].x=x;
    q[head].y=y;
    f1[x][y]=0;
    while(head<tail)
    {
        int a=q[head].x;
        int b=q[head].y;
        for(int i=0;i<8;i++)
        {
            int aa=a+dx[i];
            int bb=b+dy[i];
            if(aa<1||bb<1||aa>8||bb>8||f1[aa][bb]!=-1)
                continue;
            q[tail].step=q[head].step+1;
            f1[aa][bb]=q[tail].step;
            q[tail].x=aa;
            q[tail].y=bb;
            tail++;
        }
        head++;
    }
}

void bfs2(int x,int y)
{
    memset(f2,-1,sizeof(f2));
    head=0;
    tail=1;
    q[head].x=x;
    q[head].y=y;
    f2[x][y]=0;
    while(head<tail)
    {
        int a=q[head].x;
        int b=q[head].y;
        for(int i=0;i<8;i++)
        {
            int aa=a+dx[i];
            int bb=b+dy[i];
            if(aa<1||bb<1||aa>8||bb>8||f2[aa][bb]!=-1)
                continue;
            q[tail].step=q[head].step+1;
            f2[aa][bb]=q[tail].step;
            q[tail].x=aa;
            q[tail].y=bb;
            tail++;
        }
        head++;
    }
}
void bfs3(int x,int y)
{
    memset(f3,-1,sizeof(f3));
    head=0;
    tail=1;
    q[head].x=x;
    q[head].y=y;
    f3[x][y]=0;
    while(head<tail)
    {
        int a=q[head].x;
        int b=q[head].y;
        for(int i=0;i<8;i++)
        {
            int aa=a+dx[i];
            int bb=b+dy[i];
            if(aa<1||bb<1||aa>8||bb>8||f3[aa][bb]!=-1)
                continue;
            q[tail].step=q[head].step+1;
            f3[aa][bb]=q[tail].step;
            q[tail].x=aa;
            q[tail].y=bb;
            tail++;
        }
        head++;
    }
}

int main()
{
    int T;
    scanf("%d",&T);
    int x1,x3,x2,y1,y2,y3;
    while(T--)
    {
        char a1[5];
        char a2[5];
        char a3[5];
        scanf("%s%s%s",a1,a2,a3);
        x1=a1[0]-'A'+1;
        y1=a1[1]-'0';
        x2=a2[0]-'A'+1;
        y2=a2[1]-'0';
        x3=a3[0]-'A'+1;
        y3=a3[1]-'0';
        bfs1(x1,y1);
        bfs2(x2,y2);
        bfs3(x3,y3);
        int ans=1000;
        for(int i=1;i<=8;i++)
        {
            for(int j=1;j<=8;j++)
            {
                ans=min(f1[i][j]+f2[i][j]+f3[i][j],ans);
            }
        }
        printf("%d\n",ans);
    }
    return 0;
}