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FYI: It seems like the problem specification is broken. It said to return the number of ways to climb the stairs modulo 10^9 + 7. It seems like they really wanted to say 10^10 + 7 based on examples and accepted answers for problem.
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Recursion: Davis' Staircase
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FYI: It seems like the problem specification is broken. It said to return the number of ways to climb the stairs modulo
10^9 + 7
. It seems like they really wanted to say10^10 + 7
based on examples and accepted answers for problem.