5 lines C++ solution


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    class Solution {
    public:
        int integerReplacement(int n) {
            if(n<=1) return 0;
            if(n%2)
                return min(integerReplacement((n-1)/2)+1,integerReplacement((n-1)/2+1)+1)+1;
            else
                return integerReplacement(n/2)+1;
        }
    };

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