def newAccount(aId, userId, aType, balance):
'''
Creates a new account. It's added to the account's hashtable.
First it searches the user object to assign this new account.
Then the account is added to the user's maxheap.
Worst-Case: O(U + A + log(A))
Average-Case: θ(1)
'''
user = getUser(userId)
account = Nodes.Account(aId, userId, aType, balance)
user.addAccount(account)
accountsHash.put(account)
return account
