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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4. int main() {
  5.     long long n,cnt=0, lastTotal=0,current_consecutive=0,most_consecutive=0;
  6.     cin >> n; n -=1;
  7.     long long ti;
  8.     cin >> ti;
  9.     long long Current_type = ti;
  10.     for (long long i=1; i<=n ;i++) {
  11.         if (ti==Current_type) {
  12.             cnt++;
  13.         }
  14.         else {
  15.             lastTotal = cnt;
  16.             cnt=1;
  17.             Current_type=ti;
  18.         }
  19.         current_consecutive = min(cnt,lastTotal);
  20.  
  21.         most_consecutive = max(most_consecutive,current_consecutive);
  22.         cin >> ti;
  23.     }
  24.     cnt++;
  25.     current_consecutive = min(cnt,lastTotal);
  26.     most_consecutive = max(most_consecutive,current_consecutive);
  27.     if (most_consecutive == 0) {
  28.         cout << 2 << endl;
  29.     }
  30.     else cout << most_consecutive *2<<endl;
  31.     return 0;
  32. }
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/bq1cwZ
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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