#include <bits/stdc++.h>
#define mp(x...) array<int, 2>({x})
#define pb push_back
#define int int64_t
#define vi vector<int32_t>
using namespace std;
#include "shoes.h"
constexpr static int MXSIZE = 1e6 + 5;
struct Fenwick
{
int v[MXSIZE];
void set(int i, int val) { for (++i;i<MXSIZE;i+=i&(-i)) v[i] += val; }
int get(int i) { int res = 0; for(++i;i;i-=i&(-i)) res += v[i]; return res; }
};
int subtask1(vi& s)
{
if (s[0] > 0)
return 1;
else
return 0;
}
Fenwick fw;
int last[MXSIZE];
map<array<int, 2>, int> pos;
int subtask4(vi& s)
{
int n = s.size() / 2;
for (int i = 0; i < n; i++)
{
array<int, 2> p = {-s[i], last[s[i]]++};
pos[p] = i; // Leftover in the left
}
for (int i = 0; i < n; i++)
last[i] = 0;
int res = 0;
for (int i = n; i < 2*n; i++)
{
assert(pos.find(mp(s[i], last[s[i]])) != pos.end());
array<int, 2> p = {s[i], last[s[i]]++};
int ps = pos[p];
res += i-ps-1 - fw.get(ps);
fw.set(ps, 1);
}
return res;
}
long long count_swaps(vi s)
{
if (s.size() == 2)
return subtask1(s);
return subtask4(s);
}
