TOBO

然而并不会做。

最后就照着题解码了一遍/kk

真的好长啊。看时间就知道写了多久...

upd in 2022:

我现在已经找不到原题面是什么了（

不过感觉把这样一篇不算题解的东西放进“题解”里，多少有点不合适呢（）

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int cg[9] = {1,2,6,24,120,720,5040,40320};
char s[15];
int n,step,mark[380001];
ll v;
struct node{
    ll a;
    int s;
}p[400001],now,ad;
ll find(ll v)
{
    int ss[15];
    for(int i = 9;i >= 1;i --)
    {
        ss[i] = v  %  10;
        v /= 10;
    }
    ll ret = 0;
    for(int i = 1;i <= 8;i  ++)
    {
        int x = 0;
        for(int j = i + 1;j <= 9;j  ++)
            if(ss[i] > ss[j]) x ++;
        ret += x * cg[8 - i];
    }
    return ret;
}
ll chg1(ll x)
{
    ll tmp[10];
    for(int i = 9;i >= 1;i --)
    {
        tmp[i] = x  %  10;
        x /= 10;
    }
    ll t = tmp[1];
    tmp[1] = tmp[4]; tmp[4] = tmp[5]; tmp[5] = tmp[2]; tmp[2] = t;x = 0;
    for(int i=1; i<=9; i ++)
    {
        x *= 10;
        x += tmp[i];
    }
    return x;
}
ll chg2(ll x)
{
    ll tmp[10];
    for(int i = 9;i >= 1;i --)
    {
        tmp[i] = x  %  10;
        x /= 10;
    }
    ll t = tmp[1];
    tmp[1] = tmp[2];tmp[2] = tmp[5];tmp[5] = tmp[4];tmp[4] = t;x = 0;
    for(int i = 1;i <= 9;i  ++)
    {
        x *= 10;
        x += tmp[i];
    }
    return x;
}
ll chg3(ll x)
{
    ll tmp[10];
    for(int i = 9;i >= 1;i --)
    {
        tmp[i] = x  %  10;
        x /= 10;
    }
    ll t = tmp[2];tmp[2] = tmp[5];tmp[5] = tmp[6];tmp[6] = tmp[3];tmp[3] = t; x=0;
    for(int i = 1;i <= 9;i  ++)
    {
        x *= 10;
        x += tmp[i];
    }
    return x;
}
ll chg4(ll x)
{
    ll tmp[10];
    for(int i = 9;i >= 1;i --)
    {
        tmp[i] = x  %  10; x /= 10;
    }
    ll t = tmp[2]; tmp[2] = tmp[3];tmp[3] = tmp[6]; tmp[6] = tmp[5]; tmp[5] = t; x = 0;
    for(int i = 1;i <= 9;i  ++)
    {
        x *= 10;
        x += tmp[i];
    }
    return x;
}
ll chg5(ll x)
{
    ll tmp[10];
    for(int i = 9;i >= 1;i--)
    {
        tmp[i] = x  %  10;x /= 10;
    }
    ll t = tmp[4];tmp[4]=tmp[7];tmp[7]=tmp[8];tmp[8]=tmp[5];tmp[5]=t;x=0;
    for(int i = 1;i <= 9;i  ++)
    {
        x *= 10;
        x += tmp[i];
    }
    return x;
}
ll chg6(ll x)
{
    ll tmp[10];
    for(int i = 9;i >= 1;i --)
    {
        tmp[i] = x  %  10;
        x /= 10;
    }
    ll t = tmp[4];tmp[4] = tmp[5];tmp[5] = tmp[8];tmp[8] = tmp[7];tmp[7] = t;x = 0;
    for(int i = 1;i <= 9;i  ++)
    {
        x *= 10;
        x += tmp[i];
    }
    return x;
}
ll chg7(ll x)
{
    ll tmp[10];
    for(int i = 9;i >= 1;i --)
    {
        tmp[i] = x  %  10;
        x /= 10;
    }
    ll t = tmp[5];
    tmp[5] = tmp[8];tmp[8] = tmp[9];tmp[9] = tmp[6];tmp[6] = t;x = 0;
    for(int i = 1;i <= 9;i  ++)
    {
        x*=10;
        x+=tmp[i];
    }
    return x;
}
ll chg8(ll x)
{
    ll tmp[10];
    for(int i = 9; i >= 1; i--)
    {
        tmp[i] = x % 10;
        x /= 10;
    }
    ll t = tmp[5];
    tmp[5] = tmp[6]; tmp[6] = tmp[9]; tmp[9] = tmp[8]; tmp[8] = t;x = 0;
    for(int i = 1; i <= 9; i ++)
    {
        x *= 10;
        x += tmp[i];
    }
    return x;
}
int bfs()
{
    int st = 0,ed = 0;
    p[ed].a = v, p[ed].s = 0;
    ed ++;
    mark[find(v)] = 1;
    while(st<ed)
    {
        now = p[st ++];
        if(now.a  ==  123456789LL) return now.s;
        if(now.s>step) return -1;
        ll w;
        w = chg1(now.a);
        int ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++] = ad;
            mark[ww] = 1;
        }
        w = chg2(now.a);
        ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++] = ad;
            mark[ww] = 1;
        }
        w = chg3(now.a);
        ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++] = ad;
            mark[ww] = 1;
        }
        w = chg4(now.a);
        ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++] = ad;
            mark[ww] = 1;
        }
        w = chg5(now.a);
        ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++]  =  ad;
            mark[ww]  =  1;
        }
        w = chg6(now.a);
        ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++] = ad;
            mark[ww] = 1;
        }
        w = chg7(now.a);
        ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++] = ad;
            mark[ww] = 1;
        }
        w = chg8(now.a);
        ww = find(w);
        if(mark[ww]  ==  0)
        {
            ad.a = w; ad.s = now.s+1;
            p[ed ++] = ad;
            mark[ww] = 1;
        }
    }
    return -1;
}
int main()
{
    scanf("%d",&n);
    while(n--)
    {
        memset(mark,0,sizeof(mark));
        scanf("%s",s);
        step = s[0]-'0';
        v = 0LL;
        for(int i = 1; i <= 9; i ++)
        {
            v *= 10;
            v += s[i]-'0';
        }
        int res = bfs();
        printf("%d\n",res);
    }
    return 0;
}