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  1. #include <iostream>
  2. #include <algorithm>
  3.  
  4. int main() {
  5.     int arr[] = {0, 2, 3, 5, 5, 6, 8, 8, 8, 9};
  6.     auto beg = std::begin(arr);
  7.     auto it = std::upper_bound( beg, std::end(arr), 8 );
  8.     if( it == beg ) {
  9.         std::cout << "no value less than 8 found" << std::endl;
  10.         return 0;
  11.     }
  12.     std::cout << "index is " << std::distance( beg, it ) - 1 << std::endl;
  13.     return 0;
  14. }
Success #stdin #stdout 0s 15232KB
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Standard input is empty
stdout
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index is 8
https://ideone.com/XawiC5
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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