#include <bits/stdc++.h>
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define f first
#define se second
#define pb push_back
using namespace std;
const int N = 4e5 + 219;
const ll M = 3e5 + 19;
const ll inf = 1e15 + 10;
const ll mod = 1e9 + 7;
ll n, a[N], Last[N], Lastt[N], nx[N], prv[N], t[4 * N];
bool vis[N];
void upd(int v, int tl, int tr, int pos) {
if (tl == tr) {
t[v] = 1;
return;
}
int tm = (tl + tr) / 2;
if (pos <= tm)
upd(v * 2, tl, tm, pos);
else
upd(v * 2 + 1, tm + 1, tr, pos);
t[v] = t[v * 2] + t[v * 2 + 1];
}
ll get(int v, int tl, int tr, int l, int r) {
if (r < tl || tr < l)
return 0;
int tm = (tl + tr) / 2;
if (l <= tl && tr <= r)
return t[v];
return get(v * 2, tl, tm, l, r) + get(v * 2 + 1, tm + 1, tr, l, r);
}
ll count_swaps(vector <int> b) {
n = b.size();
for (int i = 0; i < b.size(); i++)
a[i + 1] = b[i];
for (int i = 1; i <= n; i++) {
if (a[i] < 0) {
Lastt[-a[i]] = i;
prv[i] = Last[-a[i]];
} else {
Last[a[i]] = i;
prv[i] = Lastt[a[i]];
}
}
memset(Last, 0, sizeof(Last));
memset(Lastt, 0, sizeof(Lastt));
for (int i = n; i >= 1; i--) {
if (a[i] < 0) {
Lastt[-a[i]] = i;
nx[i] = Last[-a[i]];
} else {
Last[a[i]] = i;
nx[i] = Lastt[a[i]];
}
}
ll ans = 0, t1, t2;
ll L = 1, R = n;
while (L <= R) {
t1 = nx[L] - L - get(1, 1, n, L, nx[L]) - 1;
if (a[L] > 0)
t1++;
t2 = R - prv[R] - get(1, 1, n, R, prv[R]) - 1;
if (a[R] < 0)
t2++;
if (t1 < t2) {
ans += t1;
vis[L] = vis[nx[L]] = 1;
upd(1, 1, n, L);
upd(1, 1, n, nx[L]);
} else {
ans += t2;
upd(1, 1, n, R);
upd(1, 1, n, prv[R]);
vis[R] = vis[prv[R]] = 1;
}
while (vis[L])
L++;
while (vis[R])
R--;
if (R < L || L > n || R < 0)
break;
}
return ans;
}
