LeetCode 452 Minimum Number of Arrows to Burst Balloons(贪心法)

问题：给出n个气球，已知其在二维平面中的区间[left,right]，箭只能竖直向中，气球重叠时，箭仍然可以穿过。问最少需要多少箭。

思路：贪心算法，根据右端点从小到大排序。在遍历区间时，如果当前区间的左值大于当前值，则需要增加箭，同时更新当前值。

具体代码参考：

https://github.com/wuli2496/OJ/tree/master/LeetCode/452%20Minimum%20Number%20of%20Arrows%20to%20Burst%20Balloons

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