Haskell![](//图.tk/1) by Scarab @ 2021-08-23 11:12:24
@[智子](/user/132435) 洛谷好像不允许在程序里面写O2 要开在#submit 选择语言旁边有O2 by rpmcppAFOed @ 2021-09-11 15:05:51