Location: San Francisco
Date: Dec 2019
Result: Rejection

Given 2 methods and an enum,

public void recordTweet(String tweetName, long time);

public long[] getTweetCountsPerFrequency(Frequency freq, String tweetName, long startTime, long endTime);

enum Frequency {
	MINUTE,
	HOUR,
	DAY
}

recordTweet("tweet1", 3498264982l (time in millis)) method is called multiple times for different tweetNames and times that records the time at which the tweet occurred.

For example if the tweetName tweet1 occurs five times in last 2 hours from current time {consider current time is 3 pm} (for e.g. 3 times in first hour {1 pm to 2 pm} and 2 times in second hour {2 pm to 3 pm}). then the result should be following:

getTweetCountsPerFrequency(HOUR, "tweet1", <2 pm>, <3 pm>); // should return [2]
getTweetCountsPerFrequency(HOUR, "tweet1", <1 pm>, <3 pm>); // should return [3, 2]
getTweetCountsPerFrequency(HOUR, "tweet1", <1 pm>, <2 pm>); // should return [3]
getTweetCountsPerFrequency(DAY, "tweet1", <3 pm yesterday>, <3 pm today>); // should return [5]

If I were to explain the problem in more simpler way, it can be - given method addWord(String word, long time) records the word and at which time it occured, return the array of count long[] of given word occurred every min / every hour / every day between given range startTime and endTime.

Needless to mention, I did not pass the phone interview.