added: string compression

Author: mihirs16

14. Questions/leetcode 443 - string compression.py

@@ -0,0 +1,22 @@
+# string compression | leetcode 443 | https://leetcode.com/problems/string-compression/
+# sliding window to keep track of a char's occurence
+
+class Solution:
+    def compress(self, chars: list[str]) -> int:
+        ptrL, ptrR = 0, 0
+        total = 0
+        chars += " "
+
+        while ptrR < len(chars):
+            if chars[ptrL] != chars[ptrR]:
+                chars[total] = chars[ptrL]
+                total += 1
+                group = ptrR - ptrL
+                if group > 1:
+                    for x in str(group):
+                        chars[total] = x
+                        total += 1
+                ptrL = ptrR
+            ptrR += 1
+            
+        return total