How to correctly deallocate or delete a c++ vector?

Question

I have a weird problem with vector in C++..

I created a vector and inserted 10000 integer values into it and have checked the memory utilization. It is 600 kb. But after

Answer 1

Presumably you checked memory with some system utility. Even if the vector space is freed on the heap that does not mean the heap space itself is going to be returned to the OS and reflected in the values shown in the system utility.