（提高）『数位DP』从入门到入土

参考了一下 sys 大佬的博客，通过这份题单我相信你就可以掌握数位 DP 的记搜实现了（ - [P4999 烦人的数学作业](https://www.luogu.com.cn/problem/P4999) - [P6218 [USACO06NOV] Round Numbers S](https://www.luogu.com.cn/problem/P6218) - [P2657 [SCOI2009] windy 数](https://www.luogu.com.cn/problem/P2657) - [P2602 [ZJOI2010]数字计数](https://www.luogu.com.cn/problem/P2602) - [P4317 花神的数论题](https://www.luogu.com.cn/problem/P4317) - [P4124 [CQOI2016]手机号码](https://www.luogu.com.cn/problem/P4124) - [CF855E Salazar Slytherin's Locket](https://www.luogu.com.cn/problem/CF855E) - [CF1036C Classy Numbers](https://www.luogu.com.cn/problem/CF1036C) - [CF1073E Segment Sum](https://www.luogu.com.cn/problem/CF1073E) - [CF55D Beautiful numbers](https://www.luogu.com.cn/problem/CF55D) - [SP3928 MDIGITS - Counting Digits](https://www.luogu.com.cn/problem/SP3928) - [SP10606 BALNUM - Balanced Numbers](https://www.luogu.com.cn/problem/SP10606) - [P4127 [AHOI2009]同类分布](https://www.luogu.com.cn/problem/P4127) - [SP1433 KPSUM - The Sum](https://www.luogu.com.cn/problem/SP1433) - [P6754 [BalticOI 2013 Day1] Palindrome-Free Numbers](https://www.luogu.com.cn/problem/P6754) - [P3413 SAC#1 - 萌数](https://www.luogu.com.cn/problem/P3413) - [SP8177 JZPEXT - Beautiful numbers EXTREME](https://www.luogu.com.cn/problem/SP8177) - [CF908G New Year and Original Order](https://www.luogu.com.cn/problem/CF908G) - [CF628D Magic Numbers](https://www.luogu.com.cn/problem/CF628D) - [CF401D Roman and Numbers](https://www.luogu.com.cn/problem/CF401D) - [UVA12046 Great Numbers](https://www.luogu.com.cn/problem/UVA12046) - [P3281 [SCOI2013]数数](https://www.luogu.com.cn/problem/P3281) - [P3311 [SDOI2014] 数数](https://www.luogu.com.cn/problem/P3311) - [P3303 [SDOI2013] 淘金](https://www.luogu.com.cn/problem/P3303) - [P2481 [SDOI2010]代码拍卖会](https://www.luogu.com.cn/problem/P2481) - [P2518 [HAOI2010]计数](https://www.luogu.com.cn/problem/P2518) - [UVA1640 统计问题 The Counting Problem](https://www.luogu.com.cn/problem/UVA1640) - [P1836 数页码](https://www.luogu.com.cn/problem/P1836) - [SP17247 PR003004 - Digit Sum](https://www.luogu.com.cn/problem/SP17247) - [SP10649 MYQ10 - Mirror Number](https://www.luogu.com.cn/problem/SP10649) - [P4798 [CEOI2015 Day1]卡尔文球锦标赛](https://www.luogu.com.cn/problem/P4798) - [P3286 [SCOI2014]方伯伯的商场之旅](https://www.luogu.com.cn/problem/P3286) - [P3791 普通数学题](https://www.luogu.com.cn/problem/P3791)