80分求条

#include <bits/stdc++.h>
#define int unsigned long long
using namespace std;
signed main(){
	set <int> s;
	int n,k;
	cin >> n >> k;
	for(int i=1;i<=n;i++)
	{
		int a;
		cin >> a;
		s.insert(a);
	}
	int ans = 0;
	while(!s.empty())
	{
		int cnt = 0;
		int h = *s.begin();
		while(s.count(h))
		{
			cnt++;
			s.erase(s.find(h));
			h = h*k;
		}
		ans += cnt/2+(cnt%2);
	}
	cout << ans;
	return 0;
}