Leetcode Problem 2711. Difference of Number of Distinct Values on Diagonals

2711. Difference of Number of Distinct Values on Diagonals

Leetcode Solutions

Brute Force with Sets

  1. Initialize an m x n matrix answer with zeros, where m is the number of rows and n is the number of columns in the input grid.
  2. Iterate over each cell (r, c) in the grid.
  3. Initialize two empty sets, topLeft and bottomRight.
  4. Traverse the top-left diagonal starting from (r - 1, c - 1) and moving diagonally upwards. Add each encountered value to the topLeft set.
  5. Traverse the bottom-right diagonal starting from (r + 1, c + 1) and moving diagonally downwards. Add each encountered value to the bottomRight set.
  6. Calculate the absolute difference between the sizes of topLeft and bottomRight sets and store it in answer[r][c].
  7. Return the answer matrix after filling in all the cells.
UML Thumbnail

Incremental Diagonal Traversal with Hash Maps

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