Google – Remove Alarm



Google – Remove Alarm

有一堆Alarm, 每个alarm有三个值,start time, end time和priority。要求是把那些从没有成为过最高优先级的alarm给删除。

比如有这么几个alarms:

Alarm1 (1, 2, 1)
Alarm2 (1, 4, 2)
Alarm3 (3, 5, 3)
Alarm4 (3, 4, 2)

那么比如alarm1和alarm4就是要删除的。因为alarm1和alarm2同时开始,但是第二个优先级高,等第二个结束的时候第一个alarm早就结束了。所以第一个alarm从来没有到过最高优先级。alarm4也是一样。

[Solution]
这道题学会了一种新的算法:scan-line algorithm,中文叫扫描线算法。Leetcode里的the skyline problem使用的也是这种算法。


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