SP30906 ADAUNIQ - Ada and Unique Vegetable

Ada the Ladybug is cultivating vegetables. She has a long furrow full of different kinds of it and she wants to know the number of unique vegetables on a segment of the furrow. As the cultivation is a dynamic process, a kind (on a single position) might become another kind during this process. Given furrow and a few updates, can you answer questions asking about number of unique kinds of vegetable on a segment?

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