Defining short form for data types

#1

for the sake of not having to write long long many times, i define it above the program as
typedef long long ll; and this work fine but,
#define long long ll this does not work.

how to define short forms using #define?

#2

use
#define ll long long int;

I prefer to change the int
i use #define int long long int
for this you have to make one more change
use int32_t here
int32_t main(){
}

#3

ok.Another doubt.

when i declare the arrays like a[1000005] in int main, it gives compilation error or segmentation fault.
but when i declare it above int main like just below using namespace std; it works fine. Why?

#4

this is because for any function there is memory limit
inside function you can’t declare array of size more than 10^6

#5

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