Created
April 30, 2012 15:09
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Exponentiation by squaring
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| def square(x): return x * x | |
| def mod_exp(a , b, q): | |
| print(b) | |
| if b == 0: return 1 | |
| if b % 2 == 0: return square(mod_exp(a , b / 2, q)) | |
| return a * mod_exp(a , b - 1, q) |
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