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class Solution {
public:
    double myPow(double x, int n) {
        if (n < 0 && n != -n) return 1 / myPow(x, -n);
        if (n == 0) {
            return 1;
        }
        double res = myPow(x, n/2);
        if (n % 2 == 0) {
            return res * res;
        } else {
            return res * res * x;
        }
    }
};