dsa1 min read
Sort Array by Increasing Frequency
Sort array elements by frequency ascending, breaking ties by value descending.
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Kth Largest Sum in a Binary Tree
Find the kth largest level sum in a binary tree using BFS to compute level sums then sorting or using a heap.
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Total Cost to Hire K Workers
Minimize total hiring cost by always choosing the cheapest candidate from the first or last p candidates using two min-heaps.
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Seat Reservation Manager
Design a seat manager that reserves the lowest numbered available seat and unreserves seats using a min-heap.
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Stock Price Fluctuation
Track stock prices with corrections by maintaining a sorted multiset and a timestamp-to-price map.
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