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Quick Summary
Find the root-to-leaf path in a binary tree with the smallest sum of node values.
Return the sequence of node values along that minimum sum path.
Correctly handle negative values and tie-breaking scenarios.
What This Tests
Recursive tree traversal (Depth-First Search)
Path state management and backtracking mechanics
Tracking and updating global minimums during recursion
Identifying leaf node base cases
Common Patterns
DFS/BFS
Backtracking
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