added: string compression

14. Questions/leetcode 443 - string compression.py

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+# 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