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28 lines
629 B
Python
28 lines
629 B
Python
def climb_stairs(n: int) -> int:
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"""
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LeetCdoe No.70: Climbing Stairs
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Distinct ways to climb a n step staircase where
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each time you can either climb 1 or 2 steps.
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Args:
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n: number of steps of staircase
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Returns:
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Distinct ways to climb a n step staircase
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Raises:
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AssertionError: n not positive integer
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>>> climb_stairs(3)
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3
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>>> climb_stairs(1)
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1
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"""
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assert isinstance(n,int) and n > 0, "n needs to be positive integer, your input {0}".format(0)
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if n == 1: return 1
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dp = [0]*(n+1)
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dp[0], dp[1] = (1, 1)
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for i in range(2,n+1):
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dp[i] = dp[i-1] + dp[i-2]
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return dp[n]
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