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
47
48
49
50
51
52
53
54
55
56
#include<iostream>
using namespace std;

int main() {
    int n;

    std::ios::sync_with_stdio(false);
    cin >> n;

    int numbers[201748];

    int number;

    int max = -9999;

    for(int i = 0; i < 201748; i++)
        numbers[i] = 0;

    for(int i = 0; i < n; i++) {
        cin >> number;

        numbers[number]++;
        if(number > max) max = number;
    }

    int x = 0;
    int condition = max;

    bool exit = true;
    while(x < condition){

        while(numbers[x] > 1) {
            exit = false;
            numbers[x+1] += 1;
            numbers[x] -= 2;
        }

        if(x+1 >= condition) {
            if(numbers[x+1] > 1)  {
                condition++;
            }
        }
        x++;
    }

    int r = 0;
    for(int i = 0; i <= condition; i++) {

        if(numbers[i] != 0) r = i;
    }


    cout << r << endl;


}