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  1. Use two heaps to compute running median for a sequence of numbers.


  2. Use a trie to provide fast lookup and storage of strings.

    Java 1

  3. Use depth-first search to find the largest region of connected cells in a two-dimensional array.


  4. Use merge sort to count the number of inversions in an integer array.


  5. Minimum number of flips to convert binary matrix to zero matrix using BFS.


  6. 2D matrix cells in distance order from an arbitrary cell.


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October 2021

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