Leetcode Problem 981. Time Based Key-Value Store

981. Time Based Key-Value Store

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Initialize a hashmap keyTimeMap to store key-value pairs, where the value is an array of (timestamp, value) pairs.
Implement the set method to append a new (timestamp, value) pair to the array associated with the given key in keyTimeMap.
Implement the get method to perform a binary search on the array associated with the given key to find the largest timestamp that is less than or equal to the requested timestamp.
If a suitable timestamp is found, return the corresponding value; otherwise, return an empty string.

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