STEP5.1.51598                   find the mostcomfortable road   Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2910    Accepted Submission(

find the mostcomfortable road TimeLimit: 1000/1000 MS (Java/Others)    Memory Limit:32768/32768 K (Java/Others)Total Submission(s): 8657    Accepted Submission(s): 3653 ProblemDescription XX星有许多城市，