摘要： 题目来源：http://acm.hdu.edu.cn/showproblem.php?pid=3663Power StationsTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 603Accepted Submission(s): 168Special JudgeProblem DescriptionThere are N towns in our country, and some of them are connected by elect 阅读全文