HDU-1430 魔板

#include <cstdio>
#include <iostream>
#include <fstream>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <queue>

#define rep(i, l, r) for(int i=l; i<=r; i++)
#define down(i, l, r) for(int i=l; i>=r; i--)
#define maxn 40320
#define MAX 1<<30

using namespace std;

struct node{int n[9], c;} p;
int a, o, c, n[maxn], v[maxn], ans[maxn];
bool b[maxn];
char s[9], t[9];

int Cal(node p)
{
    bool b[9]; rep(i, 1, 8) b[i] = false;
    int a = 0, c = 1;
    rep(i, 1, 8) 
    {
        rep(j, p.n[i]+1, 8) if (b[j]) a += c;
        c *= i; b[p.n[i]] = true; 
    }
    return a;
}

int main()
{ 
    queue <node> q;
    rep(i, 1, 8) p.n[i] = i; b[Cal(p)] = true; p.c = 0; q.push(p);
    while (!q.empty())
    {
        p = q.front(); q.pop(); o = Cal(p);
        a = p.n[1], p.n[1] = p.n[8], p.n[8] = a;
        a = p.n[2], p.n[2] = p.n[7], p.n[7] = a;
        a = p.n[3], p.n[3] = p.n[6], p.n[6] = a;
        a = p.n[4], p.n[4] = p.n[5], p.n[5] = a;
        p.c++;
        if (!b[Cal(p)]) { int x = Cal(p); q.push(p); b[x] = true; v[x] = 1; n[x] = o; }
        p.c--;
        a = p.n[1], p.n[1] = p.n[8], p.n[8] = a;
        a = p.n[2], p.n[2] = p.n[7], p.n[7] = a;
        a = p.n[3], p.n[3] = p.n[6], p.n[6] = a;
        a = p.n[4], p.n[4] = p.n[5], p.n[5] = a;
        
        a = p.n[1], p.n[1] = p.n[4], p.n[4] = p.n[3], p.n[3] = p.n[2], p.n[2] = a;
        a = p.n[5], p.n[5] = p.n[6], p.n[6] = p.n[7], p.n[7] = p.n[8], p.n[8] = a;
        p.c++;
        if (!b[Cal(p)]) { int x = Cal(p); q.push(p); b[x] = true; v[x] = 2; n[x] = o; }
        p.c--;
        a = p.n[1], p.n[1] = p.n[2], p.n[2] = p.n[3], p.n[3] = p.n[4], p.n[4] = a;
        a = p.n[5], p.n[5] = p.n[8], p.n[8] = p.n[7], p.n[7] = p.n[6], p.n[6] = a;
        
        a = p.n[2], p.n[2] = p.n[7], p.n[7] = p.n[6], p.n[6] = p.n[3], p.n[3] = a;
        p.c++; 
        if (!b[Cal(p)]) { int x = Cal(p); q.push(p); b[x] = true; v[x] = 3; n[x] = o; }
        p.c--;
        a = p.n[2], p.n[2] = p.n[3], p.n[3] = p.n[6], p.n[6] = p.n[7], p.n[7] = a;
    }
    while (scanf("%s%s", s, t) != EOF)
    {
        rep(i, 1, 8) rep(j, 1, 8) if (t[i-1] == s[j-1]) p.n[i] = j;
        o = Cal(p); c = 0;
        while (o) { ans[++c] = v[o]; o = n[o]; } 
        down(i, c, 1) printf("%c", ans[i]-1+‘A‘); printf("\n");
    }
    return 0;
}