Precomputing C# solution


  • -2
    J
    public class Solution {
        public bool IsPowerOfThree(int n) {
            HashSet<double> computedPowersOfThree = new HashSet<double>();
            for (int i = 0; i < 64; ++i)
            {
                computedPowersOfThree.Add(Math.Pow(3, i));
            }
            
            return computedPowersOfThree.Contains((double) n);
        }
    }
    

    I used a HashSet for constant time insertion and lookup.


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