#include "shoes.h"
#include "bits/stdc++.h"
using namespace std;
#define ll long long
ll count_swaps(vector<int> a) {
int n=a.size()/2;
ll ans=0;
map<int,int>d;
vector<int>co(2*n,0);
map<int,vector<int>>ind;
for(int i=0;i<2*n;i++) ind[a[i]].push_back(i);
for(int i=0;i<2*n;i++){
if(ind[a[i]].back()>ind[a[i]][0]){
sort(rbegin(ind[a[i]]),rend(ind[a[i]]));
}
}
for(int i=0;i<2*n;i++){
int x=a[i],y=-a[i];
if(co[i]) continue;
if(ind[x].size()==0 or ind[y].size()==0){
cout<<i<<" 1234\n";
return 1ll;
}
co[i]=1;
int f=0;
if(x>0) f=1;
f+=max(0,ind[y].back()-(i+1));
co[ind[y].back()]=1;
ind[y].pop_back();
ans+=f;
ind[x].pop_back();
}
return ans;
}
