phone screen: https://leetcode.com/discuss/interview-question/1512888/DoorDash-or-Coding-or-Max-Tree-Path-Sum

Onsite:
system design: Donation app
coding 1: similar to https://leetcode.com/problems/design-browser-history/
coding 2: Count number of substrings with exactly k distinct characters, follow up Nearest Neighbour City
HM round