Leetcode Problem 2406. Divide Intervals Into Minimum Number of Groups

2406. Divide Intervals Into Minimum Number of Groups

Leetcode Solutions

Line Sweep with Difference Array

  1. Initialize a dictionary d to keep track of the number of intervals starting and ending at each point.
  2. Iterate through each interval [l, r] in intervals.
    • Increment d[l] by 1 to mark the start of an interval.
    • Decrement d[r + 1] by 1 to mark the end of an interval.
  3. Initialize overlaps to 0 to keep track of the current number of overlapping intervals.
  4. Initialize res to 0 to keep track of the maximum number of overlaps.
  5. Sort the items of d by keys (the time points).
  6. Iterate through the sorted items of d.
    • Add the value of the current item to overlaps.
    • Update res to be the maximum of itself and overlaps.
  7. Return res as the result, which is the minimum number of groups needed.
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Min Heap Approach

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