1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
#include <cstdio>
#include <algorithm>

using namespace std;
constexpr int MAXA = 201800;
int a[MAXA];

int main() {
    int n;
    scanf("%d", &n);
    for (int i = 0; i < n; ++i) {
        int tmp;
        scanf("%d", &tmp);
        a[tmp]++;
    }
    int mx = 0;
    for (int i = 0; i < MAXA - 1; ++i) {
        if (a[i]) {
            mx = i;
        }
        a[i + 1] += a[i] / 2;
    }
    printf("%d\n", mx);
}