#include "books.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
vector<int> vis, to, mm;
int ri;
void dfs(int x){
ri = max(ri, x);
vis[x] = 1;
if (vis[to[x]] == 0) dfs(to[x]);
}
void ass(int x, int va){
mm[x] = va;
vis[x] = 2;
if (vis[to[x]] == 1) ass(to[x], va);
}
long long minimum_walk(std::vector<int> p, int s) {
int n = p.size();
ll ans = 0;
for (int i = 0; i < n; i++){
ans += abs(i - p[i]);
}
to = p;
vis.assign(n, 0), mm.assign(n, 0);
for (int i = 0; i < n; i++){
if (vis[i] == 0){
ri = 0;
dfs(i);
ass(i, ri);
}
}
int tt = 0;
for (int i = 0; i < n; i++){
if (tt < i) ans += 2;
tt = max(tt, mm[i]);
}
return ans;
}
