s→link = p→link; p→link = s
p→link = s; s→link = q
p→link = s→link; s→link = p
q→link = s; s→link = p
这道题你会答吗?花几分钟告诉大家答案吧!
扫描二维码,关注牛客网
下载牛客APP,随时随地刷题