Day6. Namespace style

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

@@ -0,0 +1,20 @@
+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;
+    }
+}