Python: Find smallest window that contains all characters of a given string
Python String: Exercise-75 with Solution
Write a Python program to find smallest window that contains all characters of a given string.
from collections import defaultdict def find_sub_string(str): str_len = len(str) # Count all distinct characters. dist_count_char = len(set([x for x in str])) ctr, start_pos, start_pos_index, min_len = 0, 0, -1, 9999999999 curr_count = defaultdict(lambda: 0) for i in range(str_len): curr_count[str[i]] += 1 if curr_count[str[i]] == 1: ctr += 1 if ctr == dist_count_char: while curr_count[str[start_pos]] > 1: if curr_count[str[start_pos]] > 1: curr_count[str[start_pos]] -= 1 start_pos += 1 len_window = i - start_pos + 1 if min_len > len_window: min_len = len_window start_pos_index = start_pos return str[start_pos_index: start_pos_index + min_len] str1 = "asdaewsqgtwwsa" print("Original Strings:\n",str1) print("\nSmallest window that contains all characters of the said string:") print(find_sub_string(str1))
Original Strings: asdaewsqgtwwsa Smallest window that contains all characters of the said string: daewsqgt
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Python: Tips of the Day
What is the difference between Python's list methods append and extend?
append: Appends object at the end.
x = [1, 2, 3] x.append([4, 5]) print (x)
[1, 2, 3, [4, 5]]
extend: Extends list by appending elements from the iterable.
x = [1, 2, 3] x.extend([4, 5]) print (x)
[1, 2, 3, 4, 5]
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