class RandomizedCollection:

    def __init__(self):
        self.hashmap = defaultdict(set)
        self.list = []

    def insert(self, val: int) -> bool:

        self.hashmap[val].add(len(self.list))
        self.list.append(val)
        return len(self.hashmap[val]) == 1

    def remove(self, val: int) -> bool:
        if self.hashmap[val]:
            indexes = self.hashmap[val]
            index = indexes.pop()

            last = self.list[-1]
            self.list[index] = last

            self.hashmap[last].add(index)
            self.hashmap[last].remove(len(self.list)-1)

            self.list.pop()
            return True
        return False

    def getRandom(self) -> int:
        return random.choice(self.list)



# Your RandomizedCollection object will be instantiated and called as such:
# obj = RandomizedCollection()
# param_1 = obj.insert(val)
# param_2 = obj.remove(val)
# param_3 = obj.getRandom()