This problem is in Contest(s) below:
Contest 1590:test
Contest 1591:贪心算法+分治算法—拓展练习
Contest 1783:计算机191-193,软工191-192,大数据19《专业实训1》- 贪心算法+分治算法拓展练习
Contest 1847:大数据2001《课程设计2》贪心&分治拓展