Smallest window in a string containing all the characters of another string
Medium Accuracy: 42.59%
Submissions: 42482 Points: 4
Given two strings S and P. Find the smallest window in the string S consisting of all the characters(including duplicates) of the string P. Return "-1" in case there is no such window present. In case there are multiple such windows of same length, return the one with the least starting index.
S = "timetopractice"
P = "toc"
Explanation: "toprac" is the smallest
substring in which "toc" can be found.
S = "zoomlazapzo"
P = "oza"
Explanation: "apzo" is the smallest
substring in which "oza" can be found.
You don't need to read input or print anything. Your task is to complete the function smallestWindow() which takes two string S and P as input paramters and returns the smallest window in string S having all the characters of the string P. In case there are multiple such windows of same length, return the one with the least starting index.
Expected Time Complexity: O(|S|) Expected Auxiliary Space: O(1)