Why variable sized arrays cause Wrong Answer on Codechef?

Question

int n;cin>>n;
int arr[n]{};

I have a small problem ,why is this decleration of array wrong?I have used it on Codechef several times until recently i got a WA!

After this I declared array as,

int n;cin>>n;
int arr[1001]{0} ; //max size of input possible

I got an AC!

You might use `std::size_t n; std::cin >> n; std::vector arr(n);`. — Jarod42, Jul 24 '18 at 08:11
@Jarod42 - depends on the problem. I'd probably define `n` as a `std::size_t`, unless there is potential that a negative of `n` would be input. — Peter, Jul 24 '18 at 08:14

Dev · Answer 1 · 2018-07-24T12:49:29.997

1

You can not declare an array in c++ of variable length .But you can create an array of variable length dynamically.

int n;
cin>>n;
int*arr = new int[n];

edited Jul 24 '18 at 12:49

answered Jul 24 '18 at 11:30

Dev

1 Answers1