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Smallest window in a string containing all the characters of another string
Medium Accuracy: 35.43% Submissions: 8079 Points: 4

Given two strings. Find the smallest window in the first string consisting of all the characters of the second string.

Example 1:

Input:
S = timetopractice
P = toc
Output: toprac
Explanation: toprac is the smallest
subset in which toc can be found.

Example 2:

Input:
S = zoomlazapzo
P = oza
Output: apzo
Explanation: To find oza in the
zoomlazapzo the smallest subset is
apzo.

Your Task:
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 inputs 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. Return "-1" in case there's no such window present. 

Expected Time Complexity: O(|S|)
Expected Auxiliary Space: O(1)

Constraints: 
1 <= |S|, |P| <= 1000

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Smallest window in a string containing all the characters of another string

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