PROBLEMS/HEAP / PRIORITY QUEUE
Heap / Priority Queue LeetCode Problems
99 hand-tagged Heap / Priority Queue problems across 3 interview patterns (Top-K Elements, Merge K Sorted Structures, Heap Simulation), ranked by importance (how often each pattern shows up in real coding interviews). Work top-down within each pattern.
| # | PROBLEM | DIFF | ELO | IMP | PATTERNS |
|---|---|---|---|---|---|
| 1 | Top K Frequent Elements | Easy | 1280 | 91 | Frequency Counting / Hash Map Lookup · Sorting + Comparison |
| 2 | Kth Largest Element in an Array | Easy | 1356 | 91 | Sorting + Comparison |
| 3 | Kth Largest Element in a Stream | Easy | 1182 | 82 | BST Operations (Insert, Delete, Validate) |
| 4 | K Closest Points to Origin | Easy | 1214 | 82 | Sorting + Comparison |
| 5 | Maximum Subsequence Score | Hard | 2056 | 78 | Sorting-Based Greedy · Sorting + Comparison |
| # | PROBLEM | DIFF | ELO | IMP | PATTERNS |
|---|---|---|---|---|---|
| 1 | Merge k Sorted Lists | Medium | 1594 | 90 | Merge Linked Lists |
| 2 | Design Twitter | Medium | 1533 | 82 | Frequency Counting / Hash Map Lookup · Top-K Elements |
| 3 | Find K Pairs with Smallest Sums | Medium | 1598 | 71 | Top-K Elements · Sorting + Comparison |
| # | PROBLEM | DIFF | ELO | IMP | PATTERNS |
|---|---|---|---|---|---|
| 1 | Find Median from Data Stream | Medium | 1706 | 91 | Sorting + Comparison |
| 2 | Task Scheduler | Medium | 1658 | 82 | Frequency Counting / Hash Map Lookup · General Greedy (Greedy is main insight) |
| 3 | Reorganize String | Medium | 1681 | 80 | General Greedy (Greedy is main insight) · Frequency Counting / Hash Map Lookup |
| 4 | IPO | Medium | 1709 | 78 | General Greedy (Greedy is main insight) · Sorting + Comparison |
| 5 | Single-Threaded CPU | Medium | 1798 | 78 | Sorting + Comparison |
EVERY PATTERN
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