Leetcode 2534

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Leetcode 2534

In this problem, there are n persons who want to enter or exit through a door. Each person can enter or exit through the door once, taking one second. We are given a non-decreasing integer array arrival of size n , where arrival[i] is the arrival time of the i th person at the door. Also, there is an array state of size n , where state[i] is 0 if person i wants to enter through the door or 1 if they want to exit through the door. The main goal is to find an array answer of size n where answer[i] is the second at which the i th person crosses the door, considering various rules regarding entering and exiting the door. We can use two pointers approach for solving this problem. First, we can create two lists, one for the entering persons and one for the exiting persons, and initialize pointers at the beginning of those lists. Next, we can iterate until both pointers reach the end of their respective lists. Finally, we can follow the rules stated in the problem description for entering and exiting persons and update the answer array accordingly. These solutions follow the same approach mentioned above and can be used for the respective programming languages. Got a question? Ask the Teaching Assistant anything you don't understand.

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There are 5 states involved. State can be transformed by folds, etc, elegantly although perhaps not with great performance. Have you tried solving the problem you referenced? Thanks to Algebraic Data Types and pattern-matching, implementing algorithms on trees and lists is a breeze e. However, some algorithms do require state and mutability for efficiency dynamic programming, doubly-linked lists, trees with links to parents and iterators over trees, many algorithms in computational geometry, etc.

In this problem, there are n persons who want to enter or exit through a door. Each person can enter or exit through the door once, taking one second. We are given a non-decreasing integer array arrival of size n , where arrival[i] is the arrival time of the i th person at the door. Also, there is an array state of size n , where state[i] is 0 if person i wants to enter through the door or 1 if they want to exit through the door. The main goal is to find an array answer of size n where answer[i] is the second at which the i th person crosses the door, considering various rules regarding entering and exiting the door.

Leetcode 2534

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