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452. Minimum Number of Arrows to Burst Balloons There are some spherical balloons taped onto a flat wall that represents the XY-plane. The balloons are represented as a 2D integer array points where points[i] = [xstart, xend] denotes a balloon whose horizontal diameter stretches between xstart and xend. You do not know the exact y-coordinates of the balloons.Arrows can be shot up directly vertic..

435. Non-overlapping Intervals Given an array of intervals intervals where intervals[i] = [starti, endi], return the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping.Note that intervals which only touch at a point are non-overlapping. For example, [1, 2] and [2, 3] are non-overlapping. Example 1:Input: intervals = [[1,2],[2,3],[3,4],[1,3]]Output: 1..