Leetcode Problem 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows

1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows

Leetcode Solutions

Min Heap Approach

  1. Initialize a min heap with a tuple containing the sum of the first elements of each row, the indices of these elements, and the row index being incremented.
  2. Repeat the following steps k times: a. Pop the smallest sum from the heap. b. For the popped sum, identify the row that was last incremented. c. If the next element in that row exists, add a new sum to the heap with the next element included. d. Ensure that duplicate combinations are not added to the heap by using a set or checking the last added indices.
  3. After k iterations, the last popped sum from the heap is the kth smallest sum.
UML Thumbnail

Binary Search with Heap

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