Problem B: Tight words
Given is an alphabet {0, 1, ... , k}, 0 <= k <= 9 .We say that a word of length n over this alphabet istight if any two neighbour digits in the word do not differby more than 1.
Input is a sequence of lines, each line contains two integer numbersk and n, 1 <= n <= 100. For eachline of input, output the percentage of tight words of lengthn over the alphabet {0, 1, ... , k} with 5 fractional digits.
Sample input
4 1
2 5
3 5
8 7
Output for the sample input
100.00000
40.74074
17.38281
0.10130
时间: 2024-11-01 12:37:26