Leetcode Problem 1508. Range Sum of Sorted Subarray Sums

1508. Range Sum of Sorted Subarray Sums

Leetcode Solutions

Priority Queue Approach

  1. Initialize a priority queue (min-heap) to store pairs of (subarray sum, next index).
  2. Add the first element of each subarray to the priority queue, along with their starting indices.
  3. Initialize a variable result to store the sum of the subarray sums within the specified range.
  4. For each step from 1 to right, do the following: a. Pop the smallest sum from the priority queue. b. If the step is within the range specified by left and right, add the sum to result. c. If the next index is less than the length of the array, calculate the next subarray sum by adding the element at the next index to the current sum, and push it back into the priority queue.
  5. Return result modulo 1e9+7.
UML Thumbnail

Brute Force with Sorting

Ask Question

Programming Language
image/screenshot of info(optional)
Full Screen
Loading...

Suggested Answer

Answer
Full Screen
Copy Answer Code
Loading...