Leetcode Problem 1943. Describe the Painting

1943. Describe the Painting

Leetcode Solutions

Sweep Line with Difference Array

  1. Initialize a dictionary d to store the difference array, which will hold the net change in color at each point.
  2. Iterate over the input segments and update d by adding the color value at the start point and subtracting it at the end point of each segment.
  3. Sort the keys of d to get the points in ascending order.
  4. Initialize variables to keep track of the previous point prev and the current color sum color.
  5. Iterate over the sorted points, and for each point: a. If color is non-zero, append a new segment [prev, current_point, color] to the result list. b. Update color by adding the net change at the current point. c. Update prev to the current point.
  6. Return the result list containing the non-overlapping segments with their color mix sums.
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Brute Force with Segment Tracking

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