Matchsticks to Square

Expert Answer & Key Takeaways

A complete guide to understanding and implementing Backtracking.

To form a square, we must partition the matchsticks into 4 groups of equal length. This length must be TotalLength / 4.

This is a special case of Partition to K Equal Sum Subsets where

K=4

. The same pruning strategies (descending sort, skip empty buckets) apply here for efficiency.

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