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
#include <iostream>
#include <vector>
using namespace std;

int main(void)
{
    ios_base::sync_with_stdio(false);
    const int vSize = 202000;
    std::vector<int> v(vSize, 0);
    int size, element;
    std::cin >> size;
    int count = size;
    int theBiggest = 0;
    while (count-- ) {
        std::cin >> element;
        v[element]++;
    }

    for(int i = 0; i < vSize - 1; i++)
    {
        if(v[i])
        {
           v[i + 1] += v[i] / 2;
           theBiggest = i;
        }
    }
    std::cout << theBiggest << std::endl;
    return 0;
}