Initial commit

205. Isomorphic Strings/205. Isomorphic Strings.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_205._Isomorphic_Strings</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

205. Isomorphic Strings/Program.cs

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+namespace _205._Isomorphic_Strings
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine(new Solution().IsIsomorphic("egg","foo"));
+        }
+    }
+}

205. Isomorphic Strings/Solution.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace _205._Isomorphic_Strings;
+
+public class Solution
+{
+    public bool IsIsomorphic(string s, string t)
+    {
+        Dictionary<char, char> table = new Dictionary<char, char>();
+        Dictionary<char, char> antiTable = new Dictionary<char, char>();
+        for(int i = 0; i < s.Length; i++)
+        {
+            char source = s[i];
+            char to = t[i];
+            if (table.ContainsKey(source))
+            {
+                if(table[source] != to)
+                    return false;
+            }
+            else
+                table.Add(source, to);
+
+            if (antiTable.ContainsKey(to))
+            {
+                if (antiTable[to] != source)
+                    return false;
+            }
+            else
+                antiTable.Add(to, source);
+        }
+        return true;
+    }
+}