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class Solution { public: double myPow(double x, int n) { if(n<0) return myPow((double)1.00000/x,-n); if(n==0) return 1.00000; if(n==1) return x; if(!n%2) return myPow(xx,n/2); else return xmyPow(x*x,(n-1)/2); } };

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