hdu 魔板

#include <iostream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <map>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <numeric>
#include <functional>
using namespace std;
#define LL long long
#define DB double
#define N 100100
#define esp 1e-6
#define MOD 100003
const int INF = 0x3f3f3f3f;
const LL INFF = 1LL << 60;
const DB EPS = 1e-9;
const DB OO = 1e15;
const DB PI = acos(-1.0);
char s[10],e[10], str[10];
int fac[] = {0,1,2,6,24,120,720,5040,40320};
struct tt{
    char a[20];
    int hash;
}u;
int vis[N][2],num[N],coutt = 0;

int kantuo(char s[])
{
    int ans = 0,temp,i,j;
    for(i = 0 ; i < 8 ; i++)
    {
        temp = 0;
        for(j = i+1; j < 8 ; j++)
            if(s[i]>s[j]) temp++;
        ans+=temp*fac[8-i-1];
    }
    return ans+1;
}
void bfs()
{
    char start[] = "12345678";
    memset(vis,0,sizeof(vis));
    int i,j,k,cur;
    queue<tt>q;
    strcpy(u.a,start);
    u.hash = kantuo(start);
    vis[u.hash][0] = N;
    q.push(u);
    while(!q.empty())
    {
        tt v = q.front();
        q.pop();
        //if(strcmp(v.a,e) == 0) return ;
        for(i = 1 ; i <= 3 ; i++)
        {
            if(i == 1){
                for(j = 7 ,k = 0; j >=0 ; j--) str[k++] = v.a[j];str[k] = ‘\0‘;
            }else if(i == 2)
            {
                str[0] = v.a[3];str[1] = v.a[0];str[2] = v.a[1];str[3] = v.a[2];
                str[4] = v.a[5];str[5] = v.a[6];str[6] = v.a[7];str[7] = v.a[4];str[8] = ‘\0‘;
            }else {
                str[0] = v.a[0];str[1] = v.a[6];str[2] = v.a[1];str[3] = v.a[3];
                str[4] = v.a[4];str[5] = v.a[2];str[6] = v.a[5];str[7] = v.a[7];str[8] = ‘\0‘;
            }
            cur = kantuo(str);
            if(vis[cur][0]) continue;
            vis[cur][0] = v.hash;
            vis[cur][1] = i;
            strcpy(u.a,str);
            u.hash = cur;
            q.push(u);
        }
    }
}
void solve()
{
    int i,k = 0;
    char pos[10];
    for(i = 0; i < 8 ; i++)
        pos[s[i]-‘0‘] = i+1+‘0‘;
    for(i = 0; i < 8 ; i++)
        str[i] = pos[e[i]-‘0‘];
    int ans = kantuo(str);
    while(vis[ans][0]!=N)
    {
        //printf("ans = %d i = %d\n",ans,vis[ans][1]);
        num[k++] = vis[ans][1];
        ans = vis[ans][0];
    }
    for(i = k -1 ; i>=0 ; i--)
        if(num[i] == 1) printf("A");
        else if(num[i] == 2) printf("B");
        else printf("C");
        printf("\n");
}
int main()
{
    //freopen("out.txt","w",stdout);
    bfs();
    while(~scanf("%s",s))
    {
        scanf("%s",e);
        solve();
    }
    return 0;
}