Updated as per requested changes

Author: suparna13

LeetCode/0076_Minimum_Window_Substring.py

@@ -3,26 +3,26 @@
 class Solution:
  def minWindow(self, s: str, t: str) -> str:
  char_frequency = defaultdict(lambda: 0)
- for c in pattern:
+ for c in t:
  char_frequency[c] += 1
  chars_matched = 0
 
  start = 0
  res = ""
 
- for end in range(len(string)):
- right_char = string[end]
- if right_char in pattern:
+ for end in range(len(s)):
+ right_char = s[end]
+ if right_char in t:
  char_frequency[right_char] -= 1
  if char_frequency[right_char] == 0:
  chars_matched += 1
 
  while start <= end and chars_matched == len(char_frequency):
  if res == "" or end-start+1 < len(res):
- res = string[start:end+1]
+ res = s[start:end+1]
 
- left_char = string[start]
- if left_char in pattern:
+ left_char = s[start]
+ if left_char in t:
  if char_frequency[left_char] == 0:
  chars_matched -= 1
  char_frequency[left_char] += 1