#include <bits/stdc++.h>
using namespace std;
#define ll long long
int n;
vector<int> a;
class Segtree {
private:
int n;
vector<int> seg;
void update(int node, int l, int r, int idx) {
if (l == r) seg[node] = 1;
else {
int mid = (l + r) / 2;
if (idx <= mid) update(node*2+1, l, mid, idx);
else update(node*2+2, mid+1, r, idx);
seg[node] = seg[node*2 + 1] + seg[node*2 + 2];
}
}
int query(int node, int start, int end, int l, int r) {
if (start > r || end < l) return 0;
else if (start >= l && end <= r) return seg[node];
else {
int mid = (start + end) / 2;
return query(node*2+1, start, mid, l, r) + query(node*2+2, mid+1, end, l, r);
}
}
public:
void init(int nn) {
n = nn;
seg.assign(n*4, 0);
}
void update(int idx) {
update(0, 0, n-1, idx);
}
int query(int l, int r) {
if (l > r) return 0;
return query(0, 0, n-1, l, r);
}
} seg;
int get_dis(int pos, int a, int b) {
a += seg.query(a+1, (2*n)-1);
b += seg.query(b+1, (2*n)-1);
int bon = a > b;
return abs(a - pos) + abs((b + bon) - (pos + 1));
}
ll count_swaps(vector<int> s) {
n = s.size();
seg.init(n);
a = s;
int c = 0;
vector<int> r(n/2, 0), l(n/2, 0);
vector<vector<int>> poss(n+1);
for (int i = 0; i < n; i++) {
poss[abs(s[i])].push_back(i);
}
for (int i = 1; i <= n; i++) {
vector<int> L, R;
for (auto j: poss[i]) {
if (abs(s[j]) != i) continue;
if (s[j] < 0) L.push_back(j);
else R.push_back(j);
}
int sz = L.size();
for (int j = 0; j < sz; j++) {
l[c] = L[j];
r[c] = R[j];
c++;
}
}
n /= 2;
vector<pair<int, int>> ord;
for (int i = 0; i < n; i++) {
ord.push_back({get_dis(0, l[i], r[i]), i});
}
ll ans = 0;
sort(ord.begin(), ord.end());
int pos = 0;
for (auto [u, v]: ord) {
ans += get_dis(pos, l[v], r[v]);
seg.update(l[v]);
seg.update(r[v]);
pos += 2;
}
return ans;
}
