#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int>a){
long long m=a.size();
long long s=0;
long long n=m/2;
//bool ok=true;
long long cnt=0;
for(int i=0; i<n; i++){
if(!(a[i]<0 && abs(a[i])==a[i+n] && a[i+n]>0)){
cnt++;
}
// if(a[i]!=a[i+n]){
// ok=false;
// }
}
if(cnt==0){
return(n*(n-1)/2);
}
for(int pos=0; pos<m; pos+=2){
if(a[pos]>0){
int nl=-a[pos];
int j=pos+1;
while(j<m and a[j]!=nl){
j++;
}
while(j>pos){
swap(a[j], a[j-1]);
j--;
s++;
}
}
int nr=-a[pos];
int j=pos+1;
while(j<m and a[j]!=nr){
j++;
}
while(j>pos+1){
swap(a[j], a[j-1]);
j--;
s++;
}
}
return s;
}
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