The stair has n steps. Every times you can up one or two steps. Give all the different solutions to upstairs.
For example n = 4.
sols = {[1,1,1,1],[1,1,2],[1,2,1],[2,2]}
n = 5
sols = {[1,1,1,1,1],[1,1,1,1,2],[1,1,2,1],[1,2,1,1],[1,2,2],[2,1,1,1],[2,1,2],[2,2,1]}
Have fun!
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