Coding Round 1: Two Variations of https://leetcode.com/problems/count-all-valid-pickup-and-delivery-options/ 1. Given array of pick up and delivery options, make sure that the array is valid. Example 1: Input: [\'P1\', \'D1\'] Output: True Explanation: P1 comes...

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LeetCode Question · Jun 2021

DoorDash Onsite

SWE Phone Screen Senior Hard

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Coding Round 1: Two Variations of 1. Given array of pick up and delivery options, make sure that the array is valid. Example 1: Input: [\'P1\', \'D1\'] Output: True Explanation: P1 comes...

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About This Question

This is a reported interview question from a doordash interview for a swe role (senior level) during the phone screen round reported in 2021.

It covers the following topics: Arrays, Sql, System Design, Backtracking, Oop, Recursion .

Difficulty rating: Hard

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Arrays Sql System Design Backtracking Oop Recursion

DoorDash Onsite

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