#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define sig signed
#define int long long
#define arr array
#define vec vector
const int N = 2e5 + 5;
int n;
arr<int, 2 * N> a;
// SIZE OF A IS 2 * N
int count_swaps(vec<sig> _a) {
n = _a.size() / 2;
int ans = n * (n - 1) / 2;
return ans;
}
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