诶，同问啊QAQ
by fy0123 @ 2018-01-24 18:38:14
20w够了 亲测
by Arashi丶 @ 2018-07-24 00:48:39
100w绝对没问题，50w也够了，反正数组不至于大到MLE
by 142857cs @ 2018-10-05 13:27:45