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Grokking the Coding Interview Patterns in Python

Open the Lock

Explore how to apply Tree Breadth-First Search to solve the Open the Lock problem. Understand how to navigate a 4-wheel lock from '0000' to a target code while avoiding deadends. This lesson helps you develop strategies to find the minimum moves required, reinforcing your grasp of BFS traversal in tree-like state spaces.

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Statement

You are given a lock with 44 circular wheels, each containing digits '0' through '9'.

  • The wheels can rotate freely and wrap around cyclically; turning '9' forward leads to '0', and turning '0’ backward leads to '9'.

  • Each move consists of rotating one wheel by one position (either forward or backward). ...