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
44
45
46
#include <string.h>
#include <cstdio>
#include <iostream>

using namespace std;

static const long MAX_A = 201800;

static bool ACount[MAX_A+1];

static long N;

int main()
{
	long i, result = 0, A;

	ios_base::sync_with_stdio(false);

	cin >> N;
	memset(ACount, 0, sizeof(ACount));
	for (i = 0; i < N; ++ i)
	{
		cin >> A;
		while(true)
		{
			if (!ACount[A])
			{
				ACount[A] = true;
				if (A > result)
				{
					result = A;
				}
				break;
			} 
			else
			{
				ACount[A] = false;
				++ A;
			}
		}
	}
	
	cout << result << endl;
	
	return 0;
}