Insert Delete GetRandom O(1)
https://leetcode.com/problems/insert-delete-getrandom-o1/ class RandomizedSet: def __init__(self): self.numMap = {} self.numList = [] def insert(self, val: int) -> bool: res = val not in self.numMap if res: self.numMap[val] = len(self.numList) self.numList.append(val) return res def remove(self, val: int) -> bool: res = val..