#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll count_swaps(vector<int> s) {
ll n = s.size() / 2;
vector<ll> p;
for (int i=0; i<2*n; i++){
if (s[i] > 0){
p.push_back(s[i]);
}
}
sort(p.begin(), p.end());
ll op = 1e9, inv; //1e9!!
do{
inv = 0;
vector<int> sc(2*n, 0);
for (int i=0; i<n; i++){
sc[2*i] = -p[i];
sc[2*i+1] = p[i];
}
for (ll i=0; i<2*n; i++){
ll j = i;
//cout << sc[j] << " " << s[i] << "\n";
while (sc[j] != s[i]){
j++;
}
inv += j - i;
while (j > i){
swap(sc[j], sc[j-1]);
j--;
}
}
op = min(op, inv);
//cout << 2 << endl;
} while (next_permutation(p.begin(), p.end()));
return op;
}
