#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
int bit[200067];
int f_sum(int r) {
int ret = 0;
for (; r >= 0; r = (r & (r + 1)) - 1)
ret += bit[r];
return ret;
}
void f_upd(int idx, int delta) {
for (; idx < 200067; idx = idx | (idx + 1))
bit[idx] += delta;
}
long long count_swaps(vector<int> s) {
int n = (int)(s.size()) / 2;
queue <int> q[2 * n + 1];
for (int i = 0; i < 2 * n; i++) {
q[s[i] + n].push(i);
}
vector <bool> fixed(2 * n);
long long answer = 0;
for (int i = 0; i < 2 * n; i++) {
if (fixed[i]) {
continue;
}
int p = q[-s[i] + n].front();
q[-s[i] + n].pop();
q[s[i] + n].pop();
fixed[p] = 1;
answer += p - i - 1;
if (s[i] > 0) {
answer++;
}
answer -= f_sum(p);
f_upd(p, 1);
}
return answer;
}
