What is ll used in the for loop in the prime_sieve function?

#1

for(ll i=3;i<=1000000;i+=2)
Here, what is ll?

#2

hi @priya_Jain we often use shortcuts in CP to reduce typing time
To do this we can use #define preprocessing directives
For eg if we write #define ll long long int
so at run time, anywhere where ll is written, will be replaced by long long int.
If you see the whole program you will see that this has been defined above the main function.