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
41
42
43
#include <iostream>

using namespace std;

void Zwieksz(int *A, int *M)
{
	A[0]++;
	if (A[0] == 2)
	{
		A[0] = 0;
		(*M)++;
		Zwieksz(A+1, M);
	}
}

int main()
{
	const int Ai_MAX = 201718;
	const int Ai_MAX_M = Ai_MAX + 19;
	int Ai, n, M;
	int A[Ai_MAX_M];

	for (int i = 0; i < Ai_MAX_M; i++) A[i] = 0;

	cin >> n;
	cin >> Ai;
	A[Ai]++;
	M = Ai;
	for (int i = 1; i < n; i++)
	{
		cin >> Ai;
		Zwieksz(A+Ai, &Ai);
		if (Ai > M) M = Ai;
	}
	cout << M << endl;
	/*for (int i = 0; i < n+19; i++)
	{
		cerr << A[i] << " ";
	}
	cerr << endl;*/

	return 0;
}