1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
#include <bits/stdc++.h>
using namespace std;

constexpr int M = 5e5+7;

int n;
int a[M];

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	
	cin >> n;
	
	for(int i=1; i<=n; i++){
		int act;
		cin >> act;
		a[act]++;
	}
	
	vector<int> v;
	for(int i=1; i<=n; i++){
		if(a[i]) v.push_back(a[i]);
	}
	
	sort(v.begin(), v.end());
	
	int tmp = 0;
	int ans = 0;
	
	while(tmp < n){
		int last = v.back();
		v.pop_back();
		tmp += last + last-1;
		ans++;
	}
	
	cout << ans << '\n';

	return 0;
}