Design Hit Counter

You are given a class `HitCounter` that records hits at given timestamps (in seconds). Implement the following methods: - `hit(timestamp)`: Records a hit that happened at the given `timestamp` (an integer representing the current time in seconds). - `getHits(timestamp)`: Returns the number of hits recorded in the past 5 minutes (i.e., in the time interval `[timestamp - 299, timestamp]`, inclusive). Both methods will be called with timestamps in chronological order (i.e., the `timestamp` parameter is always greater than or equal to the previous calls). Return the number of hits in the past 5 minutes for each call to `getHits`.