Day6. Namespace style

387. First Unique Character in a String/387. First Unique Character in a String.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_387._First_Unique_Character_in_a_String</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

387. First Unique Character in a String/Program.cs

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+namespace _387._First_Unique_Character_in_a_String;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine(new Solution().FirstUniqChar("Leetcode"));
+    }
+}

387. First Unique Character in a String/Solution.cs

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+namespace _387._First_Unique_Character_in_a_String;
+
+public class Solution
+{
+    public int FirstUniqChar(string s)
+    {
+        Dictionary<char, int> dic = new Dictionary<char, int>();
+        foreach (char ch in s)
+        {
+            if (dic.ContainsKey(ch))
+                dic[ch]++;
+            else
+                dic.Add(ch, 1);
+        }
+        for (int i = 0; i < s.Length; i++)
+            if (dic[s[i]] == 1)
+                return i;
+        return -1;
+    }
+}