zoj 3622 Magic Number （构造？）

Catch him # **Time Limit: 5000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 664 Accepted Submission(s): 307 **

A. Olesya and Rodion time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Olesya loves numbers consisting of n digits, and Rodion only likes numbers that are divisible by t. Find some number that satisfies both of them.

有若干个活动，第i个开始时间和结束时间是[Si,fi)，同一个教室安排的活动之间不能交叠，求要安排所有活动，最少需要几个教室？