[类似题目](https://www.luogu.com.cn/problem/CF535B)
by Fatelism @ 2020-11-22 11:08:50
@[ClearLoveseven](/user/260094) ？？？区别很大吧
by Spasmodic @ 2020-11-22 11:13:40
@[happydef](/user/121027) 您会吗/kk
by _lbw_ @ 2020-11-22 11:14:14
@[卢本伟。](/user/359952) 直接从首位开始扫，如果发现>=这一位存在4/7且这一位不是4/7，那么就把这一位设为这个数，然后后面全设为4即可
by Spasmodic @ 2020-11-22 11:19:18
@[happydef](/user/121027) 74个数要相等/kk
by _lbw_ @ 2020-11-22 11:21:05
@[卢本伟。](/user/359952) 啥意思
by Spasmodic @ 2020-11-22 11:25:13
74个数 是啥啊
by Spasmodic @ 2020-11-22 11:26:12
@[happydef](/user/121027) 数字中7的个数和4的个数要相等
by SfumatoCannon_ @ 2020-11-22 11:44:44
@[happydef](/user/121027) 您会做吗？
by _lbw_ @ 2020-11-22 11:50:12