public void OJ041_FirstMissingPositiveTest3()
 {
     int result = new OJ041_FirstMissingPositive().FirstMissingPositive(new int[] { });
     Assert.AreEqual(1, result);
 }
 public void OJ041_FirstMissingPositiveTest2()
 {
     int result = new OJ041_FirstMissingPositive().FirstMissingPositive(new int[] { 3, 4, -1, 1 });
     Assert.AreEqual(2, result);
 }