DWITE Online Computer Programming Contest

December 2010

Problem 3

Dominos Tiling

Counting the number of tilings of different sized boards with dominoes (i.e. 2-by-1 rectangles) can be a pretty difficult task. However, here you must only determine the number of ways to tile boards of height 3 and some width.

The input file **DATA3.txt** will contain 5 lines, each containing an integer 0 <= N <= 30, the width of the board you want to tile with dominoes.

The output file **OUT3.txt** will contain 5 lines, where each line represents the number of ways to tile a 3*N board with dominoes modulo 1000000 (i.e. The output is the remainder you get when you divide the number of ways to tile a 3*N board with dominoes by 1000000).

Sample Input:

1 4 3 25 13

Sample Output:

1 36 11 952111 413351