#include <bits/stdc++.h>
#include "shoes.h"
// #include "grader.cpp"
using namespace std;
#define all(x) x.begin(), x.end()
#define pb push_back
#define nl '\n'
long long count_swaps(vector<int> s) {
int n = s.size() / 2;
return n * 1LL * (n - 1) / 2;
}
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