Practice Square Coding Question | Real Coding Interviews

Quick Summary

Count character frequencies and initialize a leaf node for each unique character.
Sort nodes by ascending frequency, using lexicographical order as a tie-breaker.
Iteratively merge nodes by attaching the next character as the left child and the accumulated subtree as the right child.

What This Tests

Common Patterns

HashingSortingGreedy

Hint 1

Hint 2

What Interviewers May Ask Next

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