浪费掉的时间,不会再有了
2018-2019 ACM-ICPC NEERC Southern Subregional Contest Qualification Stage
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Codeforces1073 E 数位dp
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In
ACM
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codeforces
,
数位dp
给一个区间 $[l,r]$ ,问满足 $l\leq x\leq r$ 并且 $x$ 每一位数字种类不超过 $k$ 的方案数 $\rm mod$ $998244353$。
$(l,r\leq 10^{18},k\leq 10)$