The WeeOnes Kindergarten has a strange ceremony as part of its graduation: The children line up with the girls on the left and the boys on the right with a single space between the boys and the girls. By making a sequence of the following four moves, the children are to end up with all the boys on the left and all the girls on the right with a single space between the boys and the girls.
Slide left (s) The child to the right of the empty space moves into the empty space.
Slide right (S) The child to the left of the empty space moves into the empty space.
Hop left (h) The child two spaces to the right of the open space leapfrogs over the intervening child to the open space.
Hop right (H) The child two spaces to the left of the open space leapfrogs over the intervening child to the open space.
In each case, the previous position of the child who moved becomes the new open space.
For example, with two girls and two boys we begin with:
The teacher would like this process to end in a reasonable amount of time so the parents can go home (the children are probably willing to do this all day). Write a program which takes as input the numbers of girls and boys (nGirls and nBoys respectively) and finds a sequence of at most (nGirls * nBoys + nGirls + nBoys) moves which takes you from the starting position to the ending position. [Each girl must leapfrog over (or be leapfrogged over by) each boy and, on average, each child must move past the empty space.]
whereprobNumber increases sequentially from 1 to N.
There is at least 1 child and at most 24 children in a class.
For each problem instance, output the problem number at the beginning of the line then a single space, then the number of moves on a line. On each following line, output the codes for the required moves in order. Each line except the last should have 50 move characters with the remainder, if any, on the final line. The last line of a problem instance result should be a single blank line.
3 1 2 2 2 4 0 3 5 10
1 8 sHShhSHs 2 2 HH 3 65 sHShhsHHHShhhhsHHHHHshhhhhsHHHHHshhhhhsHHHHHshhhhh SHHHHshhhSHHshS
Note: Other solutions are possible; for instance:
ShsHHshS is also a solution to problem 1
SSSS, HSS, etc. are also acceptable answers to problem 2.
Note: Special judge problem, you may get "Wrong Answer" if output format error.
Greater New York 2005