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环只能有一个“There exists a way from each street to another street in the town.”

Posted by zhangcy269 at 2023-01-31 16:33:19 on Problem 1041 and last updated at 2023-01-31 16:59:45 
用dfs，别用回溯，dfs起点是第一行比较小的junction号码，
”Assume that Johnny lives at the junction ending  (,which/where/) the street appears first in the input , with smaller number“
总感觉这是个少个where或者,which的定语从句,读了半天才琢磨出来这个意思
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