#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
template <typename T>
int len(T &a){return a.size();}
struct fenwick{
vector<int> t; int n;
fenwick(int _n){
n = _n;
t.assign(n, 0);
}
void inc(int i, int val = 1){
for(; i < n; i |= i + 1) t[i] += val;
}
int sum(int i){
int s = 0;
for(; i >= 0; i = (i & (i + 1)) - 1) s += t[i];
return s;
}
int get(int l, int r){
return sum(r) - sum(l - 1);
}
};
#define ll long long
long long count_swaps(vector<int> s){
int n = len(s) / 2;
vector<vector<vector<int>>> g(2, vector<vector<int>> (n + 1));
for(int i = 2 * n - 1; i >= 0; i --){
g[s[i]<0][abs(s[i])].push_back(i);
}
vector<int> done(2 * n);
fenwick t(2 * n);
ll ans = 0;
for(int i = 0; i < 2 * n; i ++){
if(done[i]){
continue;
}
g[s[i] < 0][abs(s[i])].pop_back();
ans += g[s[i] > 0][abs(s[i])].back() - i + (s[i] > 0) - 1 - t.get(i, g[s[i] > 0][abs(s[i])].back());
t.inc(g[s[i] > 0][abs(s[i])].back());
done[g[s[i] > 0][abs(s[i])].back()] = 1;
g[s[i] > 0][abs(s[i])].pop_back();
//cout << ans << endl;
}
return ans;
}
