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| defmodule IntMath do | |
| use Bitwise | |
| def pow(_, 0), do: 1 | |
| def pow(a, 1), do: a | |
| def pow(a, n) when band(n, 1) === 0 do | |
| tmp = pow(a, n >>> 1) | |
| tmp * tmp | |
| end | |
| def pow(a, n) do | |
| a * pow(a, n-1) | |
| end | |
| end |
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