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
//Pawel Hanusik
#include <cstdio>
#include <cstring>

using namespace std;

int main()
{
    int n;
    scanf("%d", &n);

    bool skarbonka[201719 + 20];
    memset(skarbonka, false, sizeof(skarbonka));

    for(int i = 0; i < n; ++i)
    {
        int tmp;
        scanf("%d", &tmp);

        while(skarbonka[tmp])
        {
            skarbonka[tmp] = false;
            ++tmp;
        }
        skarbonka[tmp] = true;
    }

    for(int i = 201719 - 1 + 20; i >= 0; --i)
    {
        if(skarbonka[i]){
            printf("%d", i);
            break;
        }
    }

    return 0;
}