文件名称:activity
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小张子作为学生会的一名，要将足够多的会场安排给一批活动，同事又希望所使用会场
尽可能的少。
第一行为一个正整数 k (1< k< 10000)，表示待安排的活动的个数。接下来有 k 行，
每行均有两个正整数，表示第 k 个活动的开始时间和结束时间，时间计算从 0 开始，每分
钟多 1。
-Zhang s son as a student, to a sufficient number of venues to arrange a number of activities, colleagues and want to use the venue
As little as possible.
The first line a positive integer k (1 < k < 10000), indicates the number of events to be arranged. Then there are k rows,
Each row has two positive integer representing the start time of the k-th activity and end time, time calculation starts 0 per minute
More than 1 clock.
尽可能的少。
第一行为一个正整数 k (1< k< 10000)，表示待安排的活动的个数。接下来有 k 行，
每行均有两个正整数，表示第 k 个活动的开始时间和结束时间，时间计算从 0 开始，每分
钟多 1。
-Zhang s son as a student, to a sufficient number of venues to arrange a number of activities, colleagues and want to use the venue
As little as possible.
The first line a positive integer k (1 < k < 10000), indicates the number of events to be arranged. Then there are k rows,
Each row has two positive integer representing the start time of the k-th activity and end time, time calculation starts 0 per minute
More than 1 clock.
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activity.cpp