$1$ 到 $2$,费用为 $5$。 $2$ 到 $3$,费用为 $7$。 总费用为 $5+7=12$. by Super_excavator @ 2023-07-20 18:50:52
@[Super_excavator](/user/590609) 谢谢大佬 by 114514zll @ 2023-10-03 09:48:26