Find next greater element for each element in an array in O(n). How would you implement a feature that involves fetching thousand of images through network call and displaying them in collection view. Caching types available in swift and their use cases. Thread management.

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Find next greater element for each element in an array in O(n). How would you implement a feature that involves fetching thousand of images through network call and displaying them in  collection view. Caching types available in swift and their use cases. Thread management.

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