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  1. #include <vector>
  2. #include <algorithm>
  3. #include <iostream>
  4.  
  5. using namespace std;
  6.  
  7. int diff(const vector<int>& arr)
  8. {
  9.   auto first_negative = find_if(arr.begin(), arr.end(), [](const int& var){ return var < 0; });
  10.   if (first_negative == arr.end())
  11.     return 0;
  12.  
  13.   int counter = 0;
  14.   auto second_positive = find_if(arr.begin(), arr.end(), [&counter](const int& var){
  15.     if (var > 0) 
  16.       counter++;
  17.     if (counter == 2) 
  18.       return true;
  19.     else return false;
  20.   });
  21.  
  22.   if (second_positive == arr.end())
  23.     return 0;
  24.  
  25.   return *first_negative - *second_positive;
  26. }
  27.  
  28. int main()
  29. {
  30.   vector<int> ar {0, 1, 67, 89, -76, 56, -5, 0, -89, 6, 78, 89};
  31.  
  32.   cout << diff(ar) << endl;
  33.   cout << diff({0, 0, 0, 0}) << endl;
  34.   cout << diff({ -2, 1, 0, -5 }) << endl;
  35.   cout << diff({ 12, 10, 70, 5 }) << endl;
  36.  
  37.   return 0;
  38. }
Success #stdin #stdout 0s 3428KB
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https://ideone.com/bL0LQ6
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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