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All problems
Heaps problems
4 problems: 0 easy, 2 medium and 2 hard. Start at the top; each one assumes the ones above it.
Not started
Medium
Most frequent numbers
Arrays, Sorting, Heaps, Hash maps
Not started
Medium
The kth largest, without sorting everything
Arrays, Heaps
Not started
Hard
Median from a data stream
Design, Heaps
Not started
Hard
Merging many sorted lists at once
Arrays, Sorting, Heaps