After little Jim learned Fibonacci Number in the class , he was very interest in it.
Now he is thinking about a new thing – Fibonacci String .
He defines : str[n] = str[n-1] + str[n-2] ( n > 1 )
He is so crazying that if someone gives him two strings str[0] and str[1], he will calculate the str[2],str[3],str[4] , str[5]….
For example :
If str[0] = “ab”; str[1] = “bc”;
he will get the result , str[2]=”abbc”, str[3]=”bcabbc” , str[4]=”abbcbcabbc” …………;
As the string is too long ,Jim can’t write down all the strings in paper. So he just want to know how many times each letter appears in Kth Fibonacci String . Can you help him ?
The first line contains a integer N which indicates the number of test cases.
Then N cases follow.
In each case,there are two strings str[0], str[1] and a integer K (0 <= K < 50) which are separated by a blank.
The string in the input will only contains less than 30 low-case letters.
For each case,you should count how many times each letter appears in the Kth Fibonacci String and print out them in the format “X:N”.
If you still have some questions, look the sample output carefully.
Please output a blank line after each test case.
To make the problem easier, you can assume the result will in the range of int.
1 | 1 |
1 | a:1 |
This problem has a regular pattern. Let me show you.
Assume that $str[0] = 0 \space str[1] = 1$ .
occurrence times | 0 | 1 | 2 | 3 | 4 | 5 |
---|---|---|---|---|---|---|
0 | 1 | 01 | 101 | 01101 | 10101101 | |
0 | 1 | 0 | 1 | 1 | 2 | 3 |
1 | 0 | 1 | 1 | 2 | 3 | 5 |
From the table above, we can see that for $K-th$ Fibonacci String, the occurrence times of the first basic string is $Fibonacci[K - 1]$ . And the occurrence times of the second basic string is $Fibonacci[K]$. (Fibonacci started from 0);
So for the $K-th$ Fibonacci String, all the letters occurrence times is the number of occurrences in the first basic string times $Fibonacci[K - 1]$ + the number of occurrences in the second basic string times $Fibonacci[K]$ .
And remember there is a blank line after each test case.
And if you are using map, don’t forget to clear it before using it.
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