What is #define ll long long mean?
Long long is already a data type, why do we have to define it?
Prime Sieve - (doubt regarding #define ll long long)
the # define directive allows the definition of macros within your source code. These macro definitions allow constant values to be declared for use throughout your code. Macro definitions are not variables and cannot be changed by your program code like variables.
we can simply use long long int again and again in the program but it becomes so tedious to type to again and againn since it is so big
so instead of writing again and again
we can simply use ll in place of long long int
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Oh okay! Got it! Thanks!!! 