#include "books.h"
#include <bits/stdc++.h>
using namespace std;
long long N;
long long cnt[1 << 18];
bool used[1 << 18];
long long minimum_walk(vector<int> p, int s) {
N = p.size();
for (int i = 0; i < N; i++) {
if (used[i] == true || p[i] == i) continue;
int cx = i;
int cl = cx, cr = cx;
while (used[cx] == false) {
used[cx] = true;
cl = min(cl, cx);
cr = max(cr, cx);
cx = p[cx];
}
cnt[cl] += 1;
cnt[cr] -= 1;
}
for (int i = 1; i < N; i++) cnt[i] += cnt[i - 1];
long long sum = 0;
for (int i = 0; i < N; i++) sum += 2LL * cnt[i];
for (int i = 1; i < N; i++) {
if (cnt[i - 1] == 0LL && cnt[i] >= 1LL) sum += 2LL * i;
}
return sum;
}
