#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb emplace_back
#define AI(i) begin(i), end(i)
template<class T> bool chmin(T &a, T b) { return b < a && (a = b, true); }
template<class T> bool chmax(T &a, T b) { return a < b && (a = b, true); }
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] = ", args)
void kout() { cerr << endl; }
template<class T, class ...U> void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
void debug(auto l, auto r) { while (l != r) cerr << *l << " \n"[next(l)==r], ++l; }
#else
#define DE(...) 0
#define debug(...) 0
#endif
#include "books.h"
long long minimum_walk(std::vector<int> p, int s) {
int n = p.size();
ll res = 0;
for (int i = 0;i < n;++i)
res += abs(i - p[i]);
if (res == 0) return 0;
int L = 0, R = n-1;
while (p[L] == L) ++L;
while (p[R] == R) --R;
chmax(R, s), chmin(L, s);
auto expand = [&](int &l, int &r) {
int nl = l, nr = r;
auto upd = [&](int pos) {
chmax(nr, p[pos]);
chmin(nl, p[pos]);
};
upd(l), upd(r);
while (nl != l || nr != r) {
while (l > nl) {
upd(--l);
}
while (r < nr) {
upd(++r);
}
}
};
int l = s, r = s;
expand(l, r);
while (l != L || r != R) {
int costl = 0, costr = 0;
int nl = l, nr = r;
bool sig = false;
{
int sl = l, sr = r;
while (sl > L && sr <= r) {
expand(--sl, sr);
costl += 2;
}
if (sr <= r) {
sig = true;
assert(sl == L);
}
chmin(nl, sl);
chmax(nr, sr);
}
{
int sl = l, sr = r;
while (sl >= l && sr < R) {
expand(sl, ++sr);
costl += 2;
}
if (sl >= l) {
sig = true;
assert(sr == R);
}
chmin(nl, sl);
chmax(nr, sr);
}
if (sig) res += costl + costr;
else res += min(costl, costr);
l = nl, r = nr;
}
return res;
}
