Heaps
25 problems — 4 easy, 15 medium, 6 hard.
| # | Title | Difficulty | Frequency |
|---|---|---|---|
| 23 | Merge k Sorted Lists | hard | frequently asked |
| 215 | Kth Largest Element in an Array | medium | frequently asked |
| 253 | Meeting Rooms II | medium | frequently asked |
| 295 | Find Median from Data Stream | hard | frequently asked |
| 355 | Design Twitter | medium | company favorite |
| 373 | Find K Pairs with Smallest Sums | medium | frequently asked |
| 407 | Trapping Rain Water II | hard | frequently asked |
| 451 | Sort Characters By Frequency | medium | frequently asked |
| 480 | Sliding Window Median | hard | frequently asked |
| 502 | IPO | hard | less common |
| 506 | Relative Ranks | easy | warm up |
| 621 | Task Scheduler | medium | frequently asked |
| 632 | Smallest Range Covering Elements from K Lists | hard | frequently asked |
| 692 | Top K Frequent Words | medium | frequently asked |
| 703 | Kth Largest Element in a Stream | easy | frequently asked |
| 767 | Reorganize String | medium | frequently asked |
| 786 | Kth Smallest Prime Fraction | medium | occasionally asked |
| 846 | Hand of Straights | medium | frequently asked |
| 973 | K Closest Points to Origin | medium | frequently asked |
| 1046 | Last Stone Weight | easy | foundational |
| 1405 | Longest Happy String | medium | occasionally asked |
| 1642 | Furthest Building You Can Reach | medium | frequently asked |
| 1834 | Single-Threaded CPU | medium | frequently asked |
| 1845 | Seat Reservation Manager | medium | occasionally asked |
| 2558 | Take Gifts From the Richest Pile | easy | warm up |