版本1和2间的区别
于2006-04-22 14:27:26修订的的版本1
大小: 789
编辑: czk
备注:
于2008-02-23 15:34:59修订的的版本2
大小: 789
编辑: localhost
备注: converted to 1.6 markup
未发现区别!

K-based numbers. Version 2

http://acm.timus.ru/problem.aspx?space=1&num=1012

Time Limit: 1.0 second

Memory Limit: 1 000 KB

Let's consider K-based numbers, containing exactly N digits. We define a number to be valid if its K-based notation doesn't contain two successful zeroes.

Example: {{{1010230 is a valid 7-digit number 1000198 is not a valid number 0001235 is not a 7-digit number, it is a 4-digit number. }}}

Given two numbers N and K, you are to calculate an amount of valid K based numbers, contaning N digits.

You may assume that 2 <= K <= 10; 2 <= N; 4 <= N+K <= 180.

1. Input

two decimal numbers N and K

2. Output

The result in decimal notation.

3. Sample Input

2
10

4. Sample Output

90


timus1012 (2008-02-23 15:34:59由localhost编辑)

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