# include <bits/stdc++.h>
# define ll long long
using namespace std;
ll count_swaps( vector < int > s ) {
ll n = s.size(), ans = 0, sz = 0;
vector < ll > ids, used(n);
map < ll , vector < ll > > vc;
for ( ll i = 0; i < n; i++ ) {
vc[s[i]].push_back( i );
}
// cout << "Done 1" << endl;
for ( ll i = 0; i < n; i++ ) {
if ( used[i] ) {
continue;
}
ll l = i, r = *vc[-s[i]].begin();
// cout << "Done 2 " << l << ' ' << r << '\n';
vc[ s[i] ].erase( vc[ s[i] ].begin() );
ll rr = r;
used[r] = 1;
vc[-s[i]].erase( vc[-s[i]].begin() );
ll x = upper_bound( ids.begin(), ids.end(), i ) - ids.begin();
x = sz - x;
l += x;
x = upper_bound( ids.begin(), ids.end(), r ) - ids.begin();
x = sz - x;
r += x;
ans += r - l - 1;
if ( s[i] > 0 ) {
ans++;
}
sz++;
ids.push_back( rr );
}
return ans;
}
/*
int main() {
ll n;
cin >> n;
vector < ll > S(2 * n);
for ( ll i = 0; i < 2 * n; i++ ) {
cin >> S[i];
}
// cout << count_swaps( S );
}*/
