一开始栈空时做了top
by jrzhr @ 2023-10-29 20:02:28
要是b是空的，遇到一个左括号怎么办？
by lzm0107 @ 2023-10-29 20:03:44
好吧，谢谢你们，已经改好了
@[lzm0107](/user/555994) @[fu_jian_ding_yi](/user/748328)
by Twistzz__ @ 2023-10-29 20:34:13