public static void CallGoogleInterview()
{
var case1 = new[] { 1, 2, 3, 9 };
var case2 = new[] { 1, 2, 4, 4 };
var sum = 8;
var result0Case1 = Ex0.Solve(case1, sum);
var result0Case2 = Ex0.Solve(case2, sum);
var result1Case1 = Ex1.Solve(case1, sum);
var result1Case2 = Ex1.Solve(case2, sum);
var result2case1 = Ex2.Solve(case1, sum);
var result2case2 = Ex2.Solve(case2, sum);
}