#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr)
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define REP(n) FOR(O, 1, (n))
#define f first
#define s second
#define pb push_back
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
const int MAXN = 100100;
bool ch[MAXN];
long long count_swaps(std::vector<int> s) {
int n = (int)s.size();
ll ret = 0;
FOR(i, 0, n-1) {
if (ch[i]) continue;
FOR(j, i+1, n-1) {
if (ch[j]) continue;
if (abs(s[i]) == abs(s[j]) && s[i] != s[j]) {
ch[i] = ch[j] = true;
if (s[i] > s[j]) ret++;
break;
}
ret++;
}
}
return ret;
}
/*
2
2 1 -1 -2
ans:
4
3
-2 2 2 -2 -2 2
ans:
1
*/
