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]}

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35 Solutions

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Last Solution submitted on Nov 18, 2025

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J.R.! Menzinger William David Hill Christian Schröder

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