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Implement a key value store with snapshot:
get(key) -> value
put(key, value)
snapshot() -> "s0"
get(key, "s0") -> value1
put(key, value2)
snapshot() -> "s1"
get(key, "s1") -> value2
Implement a key value store with snapshot:
get(key) -> value
put(key, value)
snapshot() -> "s0"
get(key, "s0") -> value1
put(key, value2)
snapshot() -> "s1"
get(key, "s1") -> value2
Output