public void NumKLenSubstrNoRepeats_1()
        {
            var solution = new _1100_FindKLengthSubstringsWithNoRepeatedCharacters();
            var result   = solution.NumKLenSubstrNoRepeats("havefunonleetcode", 5);

            Assert.AreEqual(6, result);
        }
        public void NumKLenSubstrNoRepeats_2()
        {
            var solution = new _1100_FindKLengthSubstringsWithNoRepeatedCharacters();
            var result   = solution.NumKLenSubstrNoRepeats("home", 5);

            Assert.AreEqual(0, result);
        }