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inverse mod
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| def invmod(n, p): | |
| if n >=p : | |
| q, r = divmod(n, p) | |
| if r == 0: | |
| raise ValueError("xxx") | |
| else: | |
| n = r | |
| if n == 1: return 1 | |
| q, r = divmod(p, n) | |
| if r == 1: | |
| return p - q | |
| if r == n - 1: | |
| return q + 1 | |
| return ((p-q) * invmod(r, p)) % p |
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