Day i do not know

438. Find All Anagrams in a String/Solution.cs

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+namespace _438._Find_All_Anagrams_in_a_String;
+
+public class Solution
+{
+    public IList<int> FindAnagrams(string s, string target)
+    {
+        List<int> result = new List<int>();
+        int[] array = new int[26];
+        int[] buf = new int[26];
+        foreach(var ch in target)
+            array[ch-97]+=1;
+        for(int i = 0; i <= s.Length-target.Length; i++)
+        {
+            int chIndex = s[i]-97;
+            if (array[chIndex] != 0)
+            {
+                Array.Copy(array, buf, array.Length);
+                bool win = true;
+                for (int j = i; j < i + target.Length; j++)
+                {
+                    int chIndex2 = s[j] - 97;
+                    buf[chIndex2] -= 1;
+                    if (buf[chIndex2] < 0)
+                    {
+                        win = false;
+                        break;
+                    }
+                }
+                if (win)
+                    result.Add(i);
+            }
+        }
+        return result;
+    }
+}