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  1. #include <algorithm>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     long long n, input,input_back,output;
  8.     cin >> n;
  9.     long long eel = 0,eel_back = 0, tuna = 0,tuna_back = 0;
  10.     cin >> input; 
  11.     (input == 2? ++eel:++tuna);
  12.     long long refrence1 = 0, refrence2 = 0;
  13.     for (int i = 1; i < n; ++i)
  14.     {
  15.         input_back = input;
  16.         cin >> input;
  17.         if(input == 2 && input_back ==input)
  18.         {
  19.             ++eel;
  20.         }
  21.         else if(input == 2) // input_back != input then 
  22.         {
  23.             tuna_back = tuna;
  24.             tuna = 0;
  25.             ++eel;
  26.         }
  27.         else if(input == 1 && input_back == input) // then it is a tuna
  28.         {
  29.             ++tuna;
  30.         }
  31.         else if(input == 1) // input != input_back
  32.         {
  33.             eel_back = eel;
  34.             eel = 0;
  35.             ++tuna;
  36.         } 
  37.         refrence1 = (max(tuna,tuna_back) > refrence1 ? max(tuna,tuna_back) : refrence1);
  38.         refrence2 = (max(tuna,tuna_back) > refrence2 ? max(tuna,tuna_back) : refrence2);
  39.         output = 2 * min(refrence1,refrence2);
  40.     }
  41.     cout << output;
  42. }
  43.  
Success #stdin #stdout 0s 5296KB
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https://ideone.com/VLrXVP
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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