Reserve() function of vector

#1

Since the doubling of the vector is an expensive operation, so we use the reserve() function to initialise with a certain amount of space. But can we simply use to initialise the size when the vector is declared like:-

vectorv(1000);

instead of:-
vectorv;

v.reserve(1000);

#2

@Rohit39 hey in reserve you can not double the value like its fix, but when you use normal vector its size is not fix when its full it will double itself, yes if u want fix size you can use that reserve also.

#3

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