#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
int n,m[200005],ft[200005],o=100000;
vector<pair<int,int>> v;
queue<int> q[200005];
void up(int x,int v){
while(x<=n){
ft[x]+=v,x+=x&-x;
}
}
int qry(int x){
int res=0;
while(x)res+=ft[x],x-=x&-x;
return res;
}
long long count_swaps(vector<int> s){
n=(int)s.size();
long long ans=0;
for(int i=0;i<n;++i){
if(q[o-s[i]].empty())q[o+s[i]].push(i);
else{
int j=q[o-s[i]].front();
q[o-s[i]].pop();
v.push_back({j+1,i+1});
if(s[i]<0)++ans;
}
}
sort(v.begin(),v.end());
for(int i=n/2-1;i>=0;--i){
ans+=qry(v[i].second)-qry(v[i].first-1);
up(v[i].first,1);up(v[i].second,1);
}
return ans;
}
