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Time Limit: 2 s Memory Limit: 512 MB Total points: 100 Difficulty: [show]

#1875. 否

Statistics

The problem was used in the following contests:

給定 $k$ 和 $n$，求第 $n$ 小的正整數 $x$，使得 $x\cdot\underbrace{999\ldots9}_{k}$ 的十進位表示不包含任何數字 $9$。

輸入格式

唯一一行包含兩個整數 $k$ 和 $n$（$1\le k\le18$，$1\le n\le10^{18}$）。

輸出格式

輸出答案。

範例

輸入格式 1

1 1

輸出格式 1

輸入格式 2

1 8

輸出格式 2

輸入格式 3

1 9

輸出格式 3

輸入格式 4

1 10

輸出格式 4

輸入格式 5

5 1

輸出格式 5

輸入格式 6

5 84

輸出格式 6

輸入格式 7

5 668

輸出格式 7

輸入格式 8

5 733942

輸出格式 8

說明

當 $k=1$ 時，所有合法數字所構成的序列開頭為 $2,3,4,5,6,7,8,9,12,13,\ldots$。

Editorials

ID	Type	Status	Title	Posted By	Last Updated	Actions
#548	Editorial	Open	集训队作业解题报告 by 朱鹏睿	Qingyu	2026-01-02 22:09:16	Download

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