#include "shoes.h"
// #pragma GCC target("avx2")
#pragma GCC optimize("O3", "unroll-loops")
// #include <bits/extc++.h>
// using namespace __gnu_pbds;
#include <bits/stdc++.h>
using namespace std;
#define int long long
// template <typename T>
// using pbds_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
using pii = pair<int, int>;
template<typename T>
using prior = priority_queue<T, vector<T>, greater<T>>;
template<typename T>
using Prior = priority_queue<T>;
#define X first
#define Y second
#define eb emplace_back
#define pb push_back
#define fastIO() ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define RANDOM() random_device __rd; \
mt19937 __gen = mt19937(__rd()); \
uniform_int_distribution<int> __dis(0, 1); \
auto rnd = bind(__dis, __gen);
const int INF = 1E18;
const int mod = 1E9 + 7;
const int maxn = 1 << 18;
vector<int> BIT(maxn, 0);
void Add(int idx) {while (idx < maxn) ++BIT[idx], idx += idx&-idx;}
int Sum(int idx, int ans = 0) {while (idx) ans += BIT[idx], idx -= idx&-idx; return ans;}
int count_swaps(vector<int32_t> _S) {
vector<int> S;
for (auto x : _S) S.eb(x);
int n = S.size() / 2, ans = 0;
map<int, int> trans;
map<int, pii> place;
vector<pii> pairs;
set<int> appear;
for (int i = 0, now = S[i]; i < 2*n; now = S[++i]) {
if (!trans[now]) trans[now] = S[i];
S[i] = trans[now];
if (appear.count(S[i])) S[i] += (S[i] > 0 ? n : -n);
appear.insert(S[i]), trans[now] = S[i];
}
// for (auto x : S) cout << x << ", ";
appear.clear(), trans.clear();
for (int i = 0; i < 2*n; ++i) {
if (S[i] > 0 and !appear.count(-S[i])) ++ans;
appear.insert(S[i]);
S[i] = abs(S[i]);
}
for (int i = 0; i < 2*n; ++i) {
if (place[S[i]].first) place[S[i]].second = i + 1;
else place[S[i]].first = i + 1;
}
// for (auto x : place) cout << x.Y.X << ", " << x.Y.Y << "\n";
for (auto x : place) pairs.eb(x.Y.X, x.Y.Y);
sort(pairs.begin(), pairs.end());
for (auto pl : pairs) {
Add(pl.X), Add(pl.Y), ans += pl.Y - Sum(pl.Y);
}
return ans;
}
