#include "books.h"
#include <bits/stdc++.h>
using namespace std;
long long minimum_walk(std::vector<int> p, int s) {
int f = 0, n = p.size();
for (int i = 0; i < n; i++) {
if (p[i] == i) f++;
else break;
}
long long ans = 0;
for (int i = 0; i < n; i++) ans += abs(p[i] - i);
return ans + f * 2;
}
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