编辑代码

I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8bWF0aC5oPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwppbnQgbWFpbigpIHsKICAgIGxvbmcgbG9uZyBuOwogICAgY2luPj5uOwogICAgd2hpbGUobiE9MSl7CiAgICBpZiAobiUyPT0wKXsKICAgICAgICBjb3V0PDxuPDwiLzI9Ijw8bi8yPDxlbmRsOwogICAgICAgIG49bi8yOwogICAgfQogICAgZWxzZXsKICAgICAgICBjb3V0PDxuPDwiKjMrMT0iPDxuKjMrMTw8ZW5kbDsKICAgICAgICBuPW4qMysxOwogICAgfQogICAgfQogICAgY291dDw8IkVuZCI7CglyZXR1cm4gMDsKfQ==