Write a class that allows getting and setting key-value pairs, however a time until expiration is associated with each key.
The class has three public methods:
set(key, value, duration): accepts an integer key, an integer value, and a duration in milliseconds. Once the duration has elapsed, the key should be inaccessible. The method should return true if the same un-expired key already exists and false otherwise. Both the value and duration should be overwritten if the key already exists.
get(key): if an un-expired key exists, it should return the associated value. Otherwise it should return -1.
count(): returns the count of un-expired keys.
0 <= key, value <= 10^90 <= duration <= 10001 <= actions.length <= 100actions.length === values.lengthactions.length === timeDelays.length0 <= timeDelays[i] <= 1450actions[i] is one of "TimeLimitedCache", "set", "get" and "count""TimeLimitedCache" and must be executed immediately, with a 0-millisecond delayactions = ["TimeLimitedCache", "set", "get", "count", "get"]
values = [[], [1, 42, 100], [1], [], [1]]
timeDelays = [0, 0, 50, 50, 150]
[null, false, 42, 1, -1]actions = ["TimeLimitedCache", "set", "set", "get", "get", "get", "count"]
values = [[], [1, 42, 50], [1, 50, 100], [1], [1], [1], []]
timeDelays = [0, 0, 40, 50, 120, 200, 250]
[null, false, true, 50, 50, -1, 0]