hdu 1874 畅通工程续(两点最短路径,spfa&&floyd)畅通工程续
题目:畅通工程续Time Limit: 3000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 34450 Accepted Submission(s): 12600Problem Description某省自从实行了很多年的畅通工程