I am learning c++ and so far I know these ways to get an array of user defined size in cpp.
Method 1:
int main(){
int size;
cin>>size;
int arr[size];
}
What happens in the background? Since size is an int, does the compiler reserve ~2GB space on stack in advance until user input?
How does this compare to creating an array with a size equal to whatever upper bound is of constraints in question? Like see how a[maxn] is declared in setter’s solution here
Which is better? Why?
Method 2:
int main(){
int size;
cin>>size;
int *arr = new int[size];
...
delete []arr;
}
I was wondering which one of these is the best/safe/good practice/recommended. I am aware of vector. I am looking for ways other than that - for learning purposes.
If there is some place - article/video where I can get a better understanding of this, please link it here.
