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13 problems: 3 easy, 8 medium, 2 hard.

Easy (3)

Kth Largest Element in a Stream
Minimum Time Visiting All Points
Binary Tree Paths

Medium (8)

Spiral Matrix
Capacity To Ship Packages Within D Days
Redundant Connection
Diagonal Traverse
Find the Winner of the Circular Game
All Paths From Source to Target
Dota2 Senate
Boundary of Binary Tree

Hard (2)

Find Median from Data Stream
Permutation Sequence

Other topics

Array437
String167
Math140
SQL80
Machine Learning59
General51
Data Engineering50
Matrix26
Greedy24
Statistics19
Linked List18
Binary Search15
Graph13
Dynamic Programming11
Bit Manipulation9
Hash Table9
Backend Systems6
Simulation5
Tree5
Probability4
Sliding Window3
Stack3