SET / MULTITISET:
The elements in this container are sequentially, inserted into any element, which determines its position according to the corresponding sort criterion.
The same elements are not allowed in the SET, and there is the same element to be allowed in the MultiSet.
Map / MultiMap:
The Map is different from MultiMap in whether the same elements are allowed.
Map and SET differ in that MAP is stored in the pair of Key / Value.
And sort the elements according to Key.
