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GeezerVison is showing github.com — Python-1/maths/modular_exponential.py at master · https-github-com-nzysoft/Python-1 Expand file tree/ Copy pathmodular_exponential.pyMore file actions 45 lines (33 loc) · 877 Bytes / Copy pathmodular_exponential.pyFile metadata and controls45 lines (33 loc) · 877 Bytes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 """ Modular Exponential. Modular exponentiation is a type of exponentiation performed over a modulus. For more explanation, please check https://en.wikipedia.org/wiki/Modular_exponentiation """ """Calculate Modular Exponential.""" def modular_exponential(base: int, power: int, mod: int): """ >>> modular_exponential(5, 0, 10) 1 >>> modular_exponential(2, 8, 7) 4 >>> modular_exponential(3, -2, 9) -1 """ if power < 0: return -1 base %= mod result = 1 while power > 0: if power & 1: result = (result * base) % mod power = power >> 1 base = (base * base) % mod return result def main(): """Call Modular Exponential Function.""" print(modular_exponential(3, 200, 13)) if __name__ == "__main__": import doctest doctest.testmod() main() |
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