你确定一道绿题只需模拟？
by J与M等于Y @ 2020-10-17 11:20:41
WA的原因是没开`long long`
by J与M等于Y @ 2020-10-17 11:24:47
@[J与M等于Y](/user/158435) 啊谢（模拟是因为我觉得应该能过？
by Kiichi @ 2020-10-20 21:50:41