#include <bits/stdc++.h>
#include "shoes.h"
using namespace std;
long long count_swaps(std::vector<int> s) {
int n = (int) s.size();
long long ans = 0;
for(int i = 0; i < n - 1; ++i){
//cout << s[i] << "\n";
if(s[i] > 0){
for(int j = i + 1; j < n; ++j){
if(-s[j] == s[i]){
ans += j - i;
s.erase(s.begin() + j);
s.insert(s.begin() + i, -s[i]);
break;
}
}
++i;
}else{
for(int j = i + 1; j < n; ++j){
if(-s[j] == s[i]){
ans += j - i - 1;
s.erase(s.begin() + j);
s.insert(s.begin() + i + 1, -s[i]);
break;
}
}
++i;
}
/* for(auto it : s) cout << it << " ";
cout << endl;*/
}
/* for(auto it : s) cout << it << " ";
cout << endl;
cout << ans << endl;*/
return ans;
}
/*int main(){
freopen("input.in", "r", stdin);
freopen("output.out", "w", stdout);
cout << count_swaps({-2, 2, 2, -2, -2, 2}) << endl;
//count_swaps({-1, -2, 1, 2});
return 0;
}*/
