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Insert Interval [Medium] — Sweep and Merge
Insert a new interval into a sorted non-overlapping list and merge any overlaps in a single sweep.
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Non-overlapping Intervals [Medium] — Greedy Scheduling
Find the minimum number of intervals to remove so the rest are non-overlapping, using a greedy earliest-end-time strategy.
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Combination Sum [Medium] — Backtracking with Pruning
Find all unique combinations that sum to a target, using backtracking with candidate reuse allowed.
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Permutations [Medium] — Backtracking via Swap
Generate all permutations of distinct integers using in-place swap backtracking.
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Subsets [Medium] — Backtracking & Bit Manipulation
Generate the power set of distinct integers using backtracking or bitmask enumeration.
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