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/**

* Implement pow(x, n)

*/

public class PowXN {

public double pow(double x, int n) {

if (n == 0)

return 1;

else if (n % 2 == 0) {

double d = pow(x, n / 2);

return d * d;

} else if (n > 0) {

double d = pow(x, (n - 1) / 2);

return d * d * x;

} else {

double d = pow(x, (n + 1) / 2);

return d * d / x;

}

}

}