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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. int main() {
  5.     // declaration
  6.     int n,cnt=0,Current_type,lastTotal=0,current_consecutive=0,most_consecutive=0;
  7.     cin >> n; n -=1;
  8.     int ti;
  9.     cin >> ti;
  10.     Current_type = ti;
  11.     for (int i=1; i<=n ;i++) {
  12.         if (ti==Current_type) {
  13.             cnt++;
  14.         }
  15.         else {
  16.             lastTotal = cnt;
  17.             cnt=1;
  18.             Current_type=ti;
  19.         }
  20.         current_consecutive = min(cnt,lastTotal);
  21.  
  22.         most_consecutive = max(most_consecutive,current_consecutive);
  23.         cin >> ti;
  24.     }
  25.     if (most_consecutive == 0) {
  26.         cout << 2 << endl;
  27.     }
  28.     else cout << most_consecutive *2<<endl;
  29.     return 0;
  30. }
Success #stdin #stdout 4.46s 5316KB
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https://ideone.com/TYW4S8
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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