第二题太难了,我参考了这个代码:
https://github.com/dbarabanov/coursera/blob/master/algorithms_2/assignment_2/question_2.py
(这个答案错了)
https://github.com/sestus/algorithms-stanford/blob/master/part_2/assignment2_clustering/app/cluster_big.py
(这个答案是对的:6118)