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  1. #include <iostream>
  2. using namespace std;
  3. int main() {
  4.     int n; cin >> n;
  5.     int last_count=0,last_type=0,current_half=0,best_half=0;
  6.     int count=0;
  7.     for (int i=0; i<n ;i++) {
  8.         int type,last_half;
  9.         cin >> type;
  10.         if (type != last_type) {
  11.             last_count = count;
  12.             count = 1;
  13.         }
  14.         else count++;
  15.         last_type = type;
  16.         last_half = current_half;
  17.         current_half = min(count,last_count);
  18.         best_half = max(best_half,current_half);
  19.     }
  20.     cout << best_half*2 << endl;
  21.     return 0;
  22. }
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/moG6xT
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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