Merge K Sorted Lists using a Heap
Updated Apr 28, 2026
Short answer
Store the heads of K lists in a Min-Heap and extract the smallest iteratively.
Deep explanation
Intermediate concepts focus on problem-solving patterns. Store the heads of K lists in a Min-Heap and extract the smallest iteratively.
Real-world example
Real-time leaderboards in gaming.
Common mistakes
- Using a Max-Heap to find the K-th largest (which is less efficient than a K-sized Min-Heap).
Follow-up questions
- Time complexity of nlargest?