dsa2 min read
Longest Consecutive Sequence [Medium] — HashSet O(n)
Find the longest consecutive integer sequence in O(n) using a HashSet and only extending sequences from their start.
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Partition Labels [Medium] — Greedy Last Occurrence
Partition a string into the maximum number of parts where each letter appears in at most one part, using last occurrence mapping.
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Task Scheduler [Medium] — Greedy Frequency Buckets
Calculate minimum CPU intervals for tasks with cooldown using a greedy formula based on the most frequent task count.
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Minimum Number of Arrows to Burst Balloons [Medium] — Greedy Intervals
Find the minimum arrows needed to burst all balloons arranged as intervals using a greedy sort-by-end approach.
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Maximum Swap [Medium] — Rightmost Digit Tracking
Maximize a number by making at most one swap, using a last-occurrence map to find the optimal swap greedily.
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