Leetcode Problem 2406. Divide Intervals Into Minimum Number of Groups

2406. Divide Intervals Into Minimum Number of Groups

Leetcode Solutions

Initialize a dictionary d to keep track of the number of intervals starting and ending at each point.
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.
Initialize overlaps to 0 to keep track of the current number of overlapping intervals.
Initialize res to 0 to keep track of the maximum number of overlaps.
Sort the items of d by keys (the time points).
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.
Return res as the result, which is the minimum number of groups needed.

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