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
57
58
#include <iostream>
#include <vector>
#include <cstdio>

using namespace std;


inline void readUI(int *n)
{
    register char c = 0;
    while (c < 33) c = getchar();
    (*n) = 0;
    while (c>32)
    {
        (*n)=(*n)*10LL + (c-48); c=getchar();
    }
}

int main()
{

   int z;
   readUI(&z);

   vector <bool> sk;
   int max_sk = 201718;
   sk.resize(max_sk+1);
   int data;

   for (int i=0; i<z; i++)
   {
       readUI(&data);
       if (sk[data])
       {
           while (sk[data])
           {
              sk[data++] = false;
              if (data>max_sk)
              {
                  max_sk++;
                  sk.resize(max_sk+1);
              }
           }
           sk[data] = true;
       }
       else
          sk[data] = true;
   }

   if (max_sk == 201718)
   {
       while (!sk[max_sk])
           max_sk--;
   }
   cout << max_sk << endl;

   return 0;
}