why isnt it possible? why not you stupid bastard??

[wispy tapir]

#include <bits/stdc++.h>
int main()
{
   int n; 
   std::cin >> n; 
   std::vector<int> v(n); 
   for(int i : v)
   std::cin >> i; 
   
   for(int i : v)
   std::cout << i; 
   return 0;
}```

[dusky merlin]

When your question is answered use !solved to mark the question as resolved.

Remember to ask specific questions, provide necessary details, and reduce your question to its simplest form. For tips on how to ask a good question run !howto ask.

[wispy tapir]

why cant i insert with range based loop?

[floral vale]

@wispy tapir What do you mean

Are you getting some sort of error?

Oh nvm

[floral vale]

!f

[dusky merlin]

#include <bits/stdc++.h>
int main() {
  int n;
  std::cin >> n;
  std::vector<int> v(n);
  for (int i : v)
    std::cin >> i;

  for (int i : v)
    std::cout << i;
  return 0;
}

Programsnow

Formatted by Zelis 🔱

[floral vale]

  for (int i : v)
    std::cin >> i;
```Sets the local `i` variable, not anything in the vector

Use a reference

[wispy tapir]

ohhhh

same way functions do?

   for (int &i : v)
      std::cin >> i;```

aaand, as i understand, this is better as well?

   for (const int &i : v)
      std::cout << i;```

[floral vale]

For the second loop it doesn't mater how you do it

[wispy tapir]

:(

but why

as i see it, you dont create temporary copy of variable, access it directly, additionally, its const (which makes it faster (??) )

[floral vale]

That's micro-optimization really

References aren't magic, they're implemented as pointers under the hood, which is often something to avoid actually. But the optimizer will optimize it away in this case

So reference, const reference, or no reference won't make any difference performance wise

const won't make things faster, just prevents you from modifying

[wispy tapir]

Okie, thanks!

!close