WIth c++, using Big-O notation, indicate the Order of the following for the worst case. State any assumptions you make.

1. After arriving at a party with n people present, you shake hands with everyone there.
2. Everyone in a room with n people shakes hands with everyone else in the room.
3. You climb a flight of n stairs.
4. You slide down the banister next to a staircase with n stairs.
5. After entering an elevator in a building with n floors, you press a button to choose a floor.