有两个错误:
1. 你应该是向左和向上走,而不是向右和向下
1. check中 y>b 而不是y>n
by _Cyan_ @ 2023-05-30 21:53:50
@[WA_QAQ](/user/704634)
by _Cyan_ @ 2023-05-30 21:53:58
@[_Cyan_](/user/480292) Thank you.
by poor_OIer @ 2023-06-01 21:24:26