1p3a Experience · Jan 2026

Preorder Traversal Without Invalid Nodes

Interview Experience

Problem Statement You have a tree with n nodes. The nodes are numbered from 0 to n - 1. The tree structure is defined by a list of edges, where each item looks like [parent, child]. You ar

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About This Question

This is a candidate experience report from a snowflake interview for a swe role reported in 2025.

It covers the following topics: Arrays, Binary Tree .