Master this problem using the Breadth First Search (BFS) pattern.
When approaching Open the Lock, look for key problem signals that suggest using the Breadth First Search (BFS) pattern. Focus on reducing redundant iterations, maintaining state invariant, and optimizing space-time complexity.
Key Invariant
Maintain optimal range bounds or hash frequency state during traversal.
Expected Complexity
Time: O(N) or O(N log N) | Space: O(1) to O(N)
Study Resource
Need code templates for Breadth First Search (BFS)?
Check out our visual cheatsheet with copy-paste C++ code skeletons.