Day8-9

3. Longest Substring Without Repeating Characters/3. Longest Substring Without Repeating Characters.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_3._Longest_Substring_Without_Repeating_Characters</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

3. Longest Substring Without Repeating Characters/Program.cs

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+namespace _3._Longest_Substring_Without_Repeating_Characters;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine(new Solution().LengthOfLongestSubstring("dvdf"));
+    }
+}

3. Longest Substring Without Repeating Characters/Solution.cs

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+namespace _3._Longest_Substring_Without_Repeating_Characters;
+
+public class Solution
+{
+    public int LengthOfLongestSubstring(string s)
+    {
+        int max = 0;
+        Dictionary<char, int> dict = new Dictionary<char, int>();
+        for(int i = 0; i < s.Length; i++)
+        {
+            char c = s[i];
+            if(dict.ContainsKey(c))
+            {
+                max = Math.Max(max, dict.Count);
+                i = dict[c];
+                dict.Clear();
+            }
+            else
+                dict.Add(c, i);
+        }
+        max = Math.Max(max, dict.Count);
+        return max;
+    }
+}