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Problem Brief

Return Records πŸ₯

INTERNOA
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As an intern at Amazon, you have been assigned a task to implement the sign-in pages in the Amazon Dummy Website.

There are three sign-in pages, each with its own API:

Given a log of API requests, return the list of returns from the mock website.

Notes:

  • Initially, there are no users registered.
  • If a user is already logged in and makes a login request, the new request is unsuccessful. The original login remains active.
  • Each log is an API request and is in one of the three allowed formats.
  • The order of execution of each request is the same as the order of input.
  • The usernames and passwords are case-sensitive.

    • Function Description

    Complete the function returnRecords in the editor below.

    returnRecords has the following parameter:

  • string attempts[n]: each of the API requests

    • Returns

  • string[n]: an array of strings where #th string is the return value of the #th API request

    • ο½‘οΎŸπŸ“ ꒰ა Credit to neo݁ ΰ»’κ’± πŸ“ ｑﾟ

    1Example 1

    Input
    attempts = ["register user05 qwerty", "login user05 qwerty", "logout user05"]
    Output
    ["Registered Successfully", "Logged In Successfully", "Logged Out Successfully"]
    Explanation
    Example 1 illustration
    Check out the example image above πŸ‘†

    2Example 2

    Input
    attempts = ["register david david123", "register adam 1Adam1", "login david david123", "login adam 1adam1", "logout david"]
    Output
    ["Registered Successfully", "Registered Successfully", "Logged In Successfully", "Login Unsuccessfully", "Logged Out Successfully"]
    Explanation
    Example 2 illustration
  • register david david123: There is not user with the username "david" registered, so the registration is successful
  • register adam 1Adam1: There is not user with the username "adam" registered, so the registration is successful
  • login david david123: The username and the password for the user match with that in the database, so the login is successful
  • login adam 1adam1: The password("1adam1") does not match the actual password ("1Adam1"), so the login is unsuccessful
  • logout david: The user "David" is logged in currently, so the logout is successful

    • Constraints

    Limits and guarantees your solution can rely on.

  • 1 ≀ n ≀ 105
  • 1 ≀ |username|, |password| ≀ 10 (where |s| is the length of string s)
  • username and password are alphanumeric strings, ranges [0-9, a-z, A-Z]
    • public String[] returnRecords(String[] attempts) {
  // write your code here
}
    Input

    attempts

    ["register user05 qwerty", "login user05 qwerty", "logout user05"]

    Output

    ["Registered Successfully", "Logged In Successfully", "Logged Out Successfully"]

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