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29 lines
612 B
Python
29 lines
612 B
Python
"""Binary Exponentiation."""
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# Author : Junth Basnet
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# Time Complexity : O(logn)
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def binary_exponentiation(a, n):
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if n == 0:
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return 1
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elif n % 2 == 1:
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return binary_exponentiation(a, n - 1) * a
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else:
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b = binary_exponentiation(a, n / 2)
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return b * b
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if __name__ == "__main__":
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try:
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BASE = int(input("Enter Base : ").strip())
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POWER = int(input("Enter Power : ").strip())
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except ValueError:
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print("Invalid literal for integer")
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RESULT = binary_exponentiation(BASE, POWER)
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print("{}^({}) : {}".format(BASE, POWER, RESULT))
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