你记忆化没写对，要加
`b[i][j]=1`
by jason_sun @ 2023-01-09 12:04:48
@[345678910jpk](/user/772478)
by jason_sun @ 2023-01-09 12:05:16
@[jason_sun](/user/399762) 谢谢大佬
by F_Q_chicken @ 2023-01-09 17:51:21