Do weekly

Author: Zanger67

my-submissions/m1100.py

@@ -0,0 +1,22 @@
+class Solution:
+    def numKLenSubstrNoRepeats(self, s: str, k: int) -> int:
+        letters = set()
+        left    = 0
+        output  = 0
+
+        for c in s :
+            if c in letters :
+                while s[left] != c :
+                    letters.remove(s[left])
+                    left += 1
+                left += 1
+            letters.add(c)
+
+            while len(letters) > k :
+                letters.remove(s[left])
+                left += 1
+
+            if len(letters) == k :
+                output += 1
+
+        return output