MediumSystem design

Design browser history.

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Oracle

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Reference answer

A browser's history can be managed using two stacks: one for backward navigation and another for forward navigation. When a user visits a new URL, it's pushed onto the backward stack. When the user navigates back, the current URL is moved from the backward stack to the forward stack, and the top element of the backward stack becomes the current page. Conversely, when navigating forward, the current URL moves from the forward stack to the backward stack, and the top element of the forward stack becomes the current page. Any new navigation clears the forward stack.

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