You are given a 2D 0-indexed array of strings, access_times, with size n. For each i where 0 <= i <= n - 1, access_times[i][0] represents the name of an employee, and access_times[i][1] represents the access time of that employee. All entries in access_times are within the same day.
The access time is represented as four digits using a 24-hour time format, for example, "0800" or "2250".
An employee is said to be high-access if he has accessed the system three or more times within a one-hour period.
\n\nTimes with exactly one hour of difference are not considered part of the same one-hour period. For example, "0815" and "0915" are not part of the same one-hour period.
Access times at the start and end of the day are not counted within the same one-hour period. For example, "0005" and "2350" are not part of the same one-hour period.
Return a list that contains the names of high-access employees with any order you want.
\n\n\n
Example 1:
\n\n\nInput: access_times = [["a","0549"],["b","0457"],["a","0532"],["a","0621"],["b","0540"]]\nOutput: ["a"]\nExplanation: "a" has three access times in the one-hour period of [05:32, 06:31] which are 05:32, 05:49, and 06:21.\nBut "b" does not have more than two access times at all.\nSo the answer is ["a"].\n\n
Example 2:
\n\n\nInput: access_times = [["d","0002"],["c","0808"],["c","0829"],["e","0215"],["d","1508"],["d","1444"],["d","1410"],["c","0809"]]\nOutput: ["c","d"]\nExplanation: "c" has three access times in the one-hour period of [08:08, 09:07] which are 08:08, 08:09, and 08:29.\n"d" has also three access times in the one-hour period of [14:10, 15:09] which are 14:10, 14:44, and 15:08.\nHowever, "e" has just one access time, so it can not be in the answer and the final answer is ["c","d"].\n\n
Example 3:
\n\n\nInput: access_times = [["cd","1025"],["ab","1025"],["cd","1046"],["cd","1055"],["ab","1124"],["ab","1120"]]\nOutput: ["ab","cd"]\nExplanation: "ab" has three access times in the one-hour period of [10:25, 11:24] which are 10:25, 11:20, and 11:24.\n"cd" has also three access times in the one-hour period of [10:25, 11:24] which are 10:25, 10:46, and 10:55.\nSo the answer is ["ab","cd"].\n\n
\n
Constraints:
\n\n1 <= access_times.length <= 100access_times[i].length == 21 <= access_times[i][0].length <= 10access_times[i][0] consists only of English small letters.access_times[i][1].length == 4access_times[i][1] is in 24-hour time format.access_times[i][1] consists only of '0' to '9'.2 access times in his/her access time list (after sorting), where the index difference is at least 2 and the time difference is strictly less than 60 minutes."
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"sampleTestCase": "[[\"a\",\"0549\"],[\"b\",\"0457\"],[\"a\",\"0532\"],[\"a\",\"0621\"],[\"b\",\"0540\"]]",
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