Backtracking

Practice recursive search problems that build candidates, backtrack choices, and explore combinations.

Problem Name	Difficulty	Solution Link
0077. Combinations	Medium	View Solutions
0046. Permutations	Medium	View Solutions
0017. Letter Combinations of a Phone Number	Medium	View Solutions

Heap (Priority Queue)

Practice heap and priority queue problems for ordering, top-k queries, scheduling, and streaming data.

Dynamic Programming

Practice dynamic programming problems grouped by patterns such as states, transitions, and optimization.