This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
long long count_swaps(vector<int> S){
long long res = 0;
int n = S.size();
list<int> r; for(int i=0; i<n; i++) r.push_back(S[i]);
for (auto i = r.begin(); i!=r.end();){
int d = 0;
for (auto j = next(i); j!=r.end(); j++){
d++;
if ((*i) == -(*j)){
if (*i<0) res+=d-1; else res+=d;
r.erase(j); break;
}
}
auto p = i; i++;
r.erase(p);
}
return res;
}
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