#include "books.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
int ans;
map<pair<int,pair<int,pair<int,pair<int,vector<int>>>>>,int> mp;
void calc(int idx,vector<int> c,int cst,int h,int l){
if(cst > ans || idx < 0 || idx >= c.size())return;
if(mp[{idx,{cst,{h,{l,c}}}}] == 1)return;
mp[{idx,{cst,{h,{l,c}}}}] = 1;
bool f = 1;
for(int i = 0;i<c.size();i++)
if(i != c[i])
f = 0;
if(f && idx == 0){
ans = min(cst,ans);
return;
}
calc(idx+1,c,cst+1,h,1);
calc(idx-1,c,cst+1,h,1);
swap(h,c[idx]);
if(l)
calc(idx,c,cst,h,0);
calc(idx+1,c,cst+1,h,1);
calc(idx-1,c,cst+1,h,1);
}
ll minimum_walk(vector<int> p, int s) {
ans = 10;
calc(s,p,0,-1,0);
return ans;
}
