#include "shoes.h"
using namespace std;
typedef long long ll;
ll count_swaps(vector<int>arr){
int n=(int)arr.size();
ll res=0;
for(int i=0;i<n;i+=2){
int v=arr[i];
int i2=-1;
for(int j=i+1;j<n;j++)
if(arr[j]==-v){
i2=j;
break;
}
while(i2!=i+1){
swap(arr[i2],arr[i2-1]);
i2--;
res++;
}
if(arr[i]>arr[i+1])
res++;
}
return res;
}
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