First, Intuitive: sumOfTwo_intuitive Average: 2243 nano seconds on 100 runs
Second, A little better: sumOfTwo_complementFirst Average: 2136 nano seconds on 100 runs
Third, HashSet calculation first: sumOfTwo_complementFirst_Hash Average: 5520 nano seconds on 100 runs
First, Intuitive: sumOfTwo_intuitive Average: 2514 nano seconds on 100 runs
Second, A little better: sumOfTwo_complementFirst Average: 2256 nano seconds on 100 runs
Third, HashSet calculation first: sumOfTwo_complementFirst_Hash Average: 6085 nano seconds on 100 runs