#include "shoes.h"
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
struct BIT{
ll n;
vector<ll> a;
BIT(ll N):n(N),a(N+1,0){}
void add(ll i, ll v){
for(;i<=n;i+=i&-i) a[i] += v;
}
ll get(ll i){
ll x = 0;
for(;i>0;i-=i&-i) x += a[i];
return x;
}
};
ll invc(const vector<ll>& v){
ll n = v.size();
BIT t(n);
ll r = 0;
for(ll i = 0;i<n;i++){
r += i-t.get(v[i]+1);
t.add(v[i]+1,1);
}
return r;
}
long long count_swaps(std::vector<int> s) {
ll n = s.size()/2;
ll ans = n*n*10;
vector<pair<ll,ll>> a;
for(ll i = 0;i<n*2;i++){
if (s[i]<0) a.push_back({i,s[i]});
}
vector<ll> u(n*2,0);
for(auto &o : a){
for(ll i = 0;i<n*2;i++){
if (!u[i]&&s[i]==-o.second){
o.second = i;
u[i] = 1;
break;
}
}
//cerr << o.first << " " << o.second << "\n";
}
do{
vector<ll> p;
for(auto &o : a){
p.push_back(o.first);
p.push_back(o.second);
}
ans = min(ans,invc(p));
}while(next_permutation(a.begin(),a.end()));
return ans;
}
