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* f-string update rsa_cipher.py * f-string update rsa_key_generator.py * f-string update burrows_wheeler.py * f-string update non_recursive_segment_tree.py * f-string update red_black_tree.py * f-string update deque_doubly.py * f-string update climbing_stairs.py * f-string update iterating_through_submasks.py * f-string update knn_sklearn.py * f-string update 3n_plus_1.py * f-string update quadratic_equations_complex_numbers.py * f-string update nth_fibonacci_using_matrix_exponentiation.py * f-string update sherman_morrison.py * f-string update levenshtein_distance.py * fix lines that were too long
44 lines
955 B
Python
44 lines
955 B
Python
#!/usr/bin/env python3
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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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>>> climb_stairs(-7) # doctest: +ELLIPSIS
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Traceback (most recent call last):
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...
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AssertionError: n needs to be positive integer, your input -7
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"""
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assert (
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isinstance(n, int) and n > 0
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), f"n needs to be positive integer, your input {n}"
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if n == 1:
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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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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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