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15 lines
341 B
Python
15 lines
341 B
Python
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def gcd(a, b):
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while a != 0:
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a, b = b % a, a
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return b
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def findModInverse(a, m):
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if gcd(a, m) != 1:
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return None
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u1, u2, u3 = 1, 0, a
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v1, v2, v3 = 0, 1, m
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while v3 != 0:
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q = u3 // v3
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v1, v2, v3, u1, u2, u3 = (u1 - q * v1), (u2 - q * v2), (u3 - q *v3), v1, v2, v3
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return u1 % m
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