区间覆盖问题的算法实现
问题描述：给出x轴上N条线段的坐标，从中选出一些线段来覆盖区间【0，M】，要求所用线段数目最少
-Interval coverage of the realization of the algorithm description: In this paper, x-axis N be the coordinates of line segment, selected to cover a number of line segments [interval 0, M], requirement by the number of segments at least
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