#981

Time Based Key-Value Store

specialist · 885 · lc medium +31 · 49.8% accepted · 5,249 likes · top 37%

Description

Implement TimeMap, a time-stamped key-value store:

- TimeMap() initializes the structure.

- void set(String key, String value, int timestamp) saves value under key at timestamp (timestamps are strictly increasing).

- String get(String key, int timestamp) returns the value stored for key at the greatest timestamp ≤ the given one, or "" if no such entry exists.

Example 1:

Input

["TimeMap", "set", "get", "get", "set", "get", "get"]

[[], ["foo", "bar", 1], ["foo", 1], ["foo", 3], ["foo", "bar2", 4], ["foo", 4], ["foo", 5]]

Output

[null, null, "bar", "bar", null, "bar2", "bar2"]

Example 2:

Explanation

TimeMap timeMap = new TimeMap();

timeMap.set("foo", "bar", 1); // store the key "foo" and value "bar" along with timestamp = 1.

timeMap.get("foo", 1); // return "bar"

timeMap.get("foo", 3); // return "bar", since there is no value corresponding to foo at timestamp 3 and timestamp 2, then the only value is at timestamp 1 is "bar".

timeMap.set("foo", "bar2", 4); // store the key "foo" and value "bar2" along with timestamp = 4.

timeMap.get("foo", 4); // return "bar2"

timeMap.get("foo", 5); // return "bar2"

Code

class TimeMap:

    def __init__(self):
        

    def set(self, key: str, value: str, timestamp: int) -> None:
        

    def get(self, key: str, timestamp: int) -> str:
        


# Your TimeMap object will be instantiated and called as such:
# obj = TimeMap()
# obj.set(key,value,timestamp)
# param_2 = obj.get(key,timestamp)

class TimeMap:

    def __init__(self):
        

    def set(self, key: str, value: str, timestamp: int) -> None:
        

    def get(self, key: str, timestamp: int) -> str:
        


# Your TimeMap object will be instantiated and called as such:
# obj = TimeMap()
# obj.set(key,value,timestamp)
# param_2 = obj.get(key,timestamp)