#include "shoes.h"
#include <bits/stdc++.h>
#define ll long long
#define str string
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define vc vector<char>
#define vvc vector<vc>
#define vi vector<int>
#define vvi vector<vi>
#define vvvi vector<vvi>
#define vvvvi vector<vvvi>
#define vll vector<ll>
#define vvll vector<vll>
#define vvvll vector<vvll>
#define vvvvll vector<vvvll>
#define vs vector<str>
#define vvs vector<vs>
#define vpii vector<pii>
#define vvpii vector<vpii>
#define vpll vector<pll>
#define vvpll vector<vpll>
#define vb vector<bool>
#define vvb vector<vb>
#define rep(i, a, b) for (int i = (a); i < int(b); i++)
#define repi(i, a, b) for (int i = (a); i <= int(b); i++)
using namespace std;
//TODO: SOLUTION
void mktr(vi & T, int n) {
int m = 1;
while (m < n)
m *= 2;
T = vi(2 * m, 1);
for (int i = m - 1; i > 0; i--) {
T[i] = T[2 * i] + T[2 * i + 1];
}
}
void upd(vi & T, int x, int y) {
x += T.size() / 2;
T[x] = y;
x /= 2;
while (x > 0) {
T[x] = T[2 * x] + T[2 * x + 1];
x /= 2;
}
}
int get_sum(vi & T, int l, int r) {
int sum = 0;
l += T.size() / 2;
r += T.size() / 2;
while (l <= r) {
if (l == 0 && r == 0)
return sum;
if (l % 2 == 1) {
sum += T[l++];
}
if (r % 2 == 0) {
sum += T[r--];
}
l /= 2;
r /= 2;
}
return sum;
}
ll count_swaps(vi shoes) {
int n = shoes.size() / 2;
ll ans = 0;
vector<queue<int>> pos(2 * n + 1);
rep(i, 0, 2 * n) {
int x = shoes[i];
if (shoes[i] < 0)
x = -x + n;
pos[x].push(i);
}
vi tr;
mktr(tr, 2*n);
int m = tr.size() / 2;
rep(i, 0, 2 * n) {
if (tr[m + i] == 0)
continue;
int x = shoes[i];
int y = x + n;
if (x < 0) {
y = -x;
x = -x + n;
}
int ps = pos[y].front();
pos[y].pop();
pos[x].pop();
ll moves = get_sum(tr, i + 1, ps - 1);
if (y > n)
moves++;
//cerr << i << " " << ps << " " << moves << endl;
ans += moves;
upd(tr, ps, 0);
}
return ans;
}
/*int main() {
vi sh1 = {2, 1, -1, -2};
vi sh2 = {-2, 2, 2, -2, -2, 2};
vi sh3 = {-2, -2, -1, -1, 1, 1, 2, 2};
vi sh4 = {1, -1, -1, 1};
cout << count_swaps(sh1) << endl;
cout << count_swaps(sh2) << endl;
cout << count_swaps(sh3) << endl;
cout << count_swaps(sh4) << endl;
return 0;
}*/
