Program for connecting users by simulating adding friends, recommending new friends and removing friends.
- Read users from file.
- Read users' relations from file.
- Login.
- Search for user by username.
- Show friend list.
- Add friends.
- Delete friends.
- Get friends recommendations.
- Logout.
- Linked List.
- Treap (Priority used in treap is set to a random number < 100).