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  1. #include <iostream>     // std::cout
  2. #include <algorithm>    // std::lower_bound, std::upper_bound, std::sort
  3. #include <vector>       // std::vector
  4.  
  5. template<class ForwardIt, class T>
  6. T upperBoundIndex(ForwardIt first, ForwardIt last, const T& value)
  7. {
  8. 	return (std::upper_bound (first, last, value) - first);
  9. }
  10.  
  11. int main () {
  12.   int myints[] = {10,20,30,30,20,10,10,20};
  13.   std::vector<int> v(myints,myints+8);           // 10 20 30 30 20 10 10 20
  14.  
  15.   std::sort (v.begin(), v.end());                // 10 10 10 20 20 20 30 30
  16.  
  17.   std::vector<int>::iterator low,up;
  18.   low=std::lower_bound (v.begin(), v.end(), 20); //          ^
  19.   up= std::upper_bound (v.begin(), v.end(), 20); //                   ^
  20.  
  21.   std::cout << "lower_bound at position " << (low- v.begin()) << '\n';
  22.   std::cout << "upper_bound at position " << (up - v.begin()) << '\n';
  23.  
  24.   std::cout << "Using upperBoundIndex() :  " << upperBoundIndex(v.begin(), v.end(), 20);
  25. }
  26.  
Success #stdin #stdout 0s 3276KB
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Standard input is empty
stdout
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lower_bound at position 3
upper_bound at position 6
Using upperBoundIndex() :  6
https://ideone.com/5E172T
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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