#include <bits/stdc++.h>
using namespace std;
const int maxn = 200005;
int n;
int paired [maxn];
stack <int> st [maxn];
int fenwick [maxn];
void upd (int x){
while (x <= n){
fenwick [x] ++;
x += x & -x;
}
}
int query (int x){
int ans = 0;
while (x > 0){
ans += fenwick [x];
x -= x & -x;
}
return ans;
}
long long count_swaps (vector <int> a){
n = a.size ();
long long ans = 0;
for (int i = 0; i < n; i ++){
int size = abs (a [i]);
if (st [size].empty () || a [st [size].top ()] == a [i]) st [size].push (i);
else{
paired [st [size].top ()] = i;
paired [i] = -1;
if (a [i] < 0) ans ++;
st [size].pop ();
}
}
int cnt = 0;
for (int i = 0; i < n; i ++){
if (paired [i] == -1) continue;
ans += cnt * 2;
ans -= query (paired [i]);
ans -= query (i);
upd (paired [i]);
cnt ++;
}
return ans;
}
//int main (){
//cout << count_swaps ({2, 1, -1, -2}) << '\n';
//}
