for loop reverse C++

// Using iterators
for (auto it = s.crbegin() ; it != s.crend(); ++it) {
  std::cout << *it;
}

// Naive
for (int i = s.size() - 1; i >= 0; i--) {
  std::cout << s[i];
}

// string::rbegin/rend
#include <iostream>
#include <string>

int main ()
{
  std::string str ("now step live...");
  for (std::string::reverse_iterator rit=str.rbegin(); rit!=str.rend(); ++rit)
    std::cout << *rit;
  return 0;
}

...evil pets won