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 <iostream>
#include <vector>
#include <algorithm>
#include "shoes.h"
using namespace std;
#define ll long long
ll count_swaps(vector<int> s) {
int n = s.size() / 2;
ll ans = 0;
for (int i = n - 1; i >= 0; i--) {
ans += i;
}
return ans;
}
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