Leetcode Problem 3

solution.cs

public int LengthOfLongestSubstring(string s)
{
    if(s.Length == 0)
        return 0;

    if (s.Length == 1)
        return 1;

    var maxLength = 1;
    var curLength = 0;
    var chars= new Dictionary<char, bool>(); 

    for (var i = 0; i < s.Length; i++)
    {
        chars.Clear();
        var firstChar = s[i];
        chars[firstChar] = true;
        curLength = 1;

        for (var j = i+1; j < s.Length; j++)
        {
            var currentChar = s[j];
            if (chars.ContainsKey(currentChar))
            {
                if (j == s.Length - 1)
                {
                    return maxLength;
                }
                break;
            }

            chars[currentChar] = true;
            curLength++;
            if (maxLength <= curLength)
                maxLength = curLength;

            if (j == s.Length - 1)
            {
                return maxLength;
            }

        }
    }

    return maxLength;
}

tests1.cs

[Test]
public void ShouldReturnTheWholeThing()
{
    var str = "qwertyuiop";
    var res = _sut.LengthOfLongestSubstring(str);
    res.ShouldBe(str.Length);
}

[Test]
public void ShouldReturnZeroIfEmpty()
{
    var res = _sut.LengthOfLongestSubstring("");
    res.ShouldBe(0);
}

tests2.cs

[Test]
public void ShouldReturnOneIfOneCharacter()
{
    var str = "o";
    var res = _sut.LengthOfLongestSubstring(str);
    res.ShouldBe(str.Length);
}

[Test]
public void ShouldReturnOneIfAllTheSame()
{
    var str = "bbbbb";
    var res = _sut.LengthOfLongestSubstring(str);
    res.ShouldBe(1);
}

tests3.cs

[Test]
public void ShouldReturnLongStringAtBeginning()
{
    var str = "poiuytytweqwrtwyr";
    var res = _sut.LengthOfLongestSubstring(str);
    res.ShouldBe(6);
}

[Test]
public void ShouldReturnLongStringAtTheEnd()
{
    var str = "rywtrwqewtytyuiop";
    var res = _sut.LengthOfLongestSubstring(str);
    res.ShouldBe(6);
}

[Test]
public void ShouldReturnLongStringInTheMiddle()
{
    var str = "qweqrrplikfudjggtyr";
    var res = _sut.LengthOfLongestSubstring(str);
    res.ShouldBe(10);
}