#include "books.h"
#include<bits/stdc++.h>
#define vi vector<int>
#define vb vector<bool>
#define pii pair<int,int>
#define vpii vector<pair<int,int>>
#define vvi vector<vi>
#define mp make_pair
#define pb push_back
#define f0r(i,n) for(int i = 0; i<n; i++)
#define FOR(i, k, n) for(int i = k; i<n; i++)
#define dout(x) cout<<x<<' '<<#x<<endl;
#define dout2(x,y) cout<<x<<' '<<#x<<' '<<y<<' '<<#y<<endl;
#define vout(x) for(auto u : x)cout<<u<<' '; cout<<endl;
using namespace std;
long long minimum_walk(std::vector<signed> p, signed s) {
int n = p.size(), ans = 0; f0r(i,n)ans+=abs(p[i]-i); vi dif(n); f0r(i,n){int a = i, b = p[i]; if(a>b)swap(a,b); dif[a]++; dif[b]--;}
int cur = 0; vi w(n-1); int lst = -1; f0r(i,n-1){cur+=dif[i]; if(cur)w[i]=1,lst=i;}
for(int i = lst; i >= 0; i--)if(w[i]==0)ans+=2; return ans;
}
