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# Window String

Problem Description

Given a string A and a string B, find the window with minimum length in A, which will contain all the characters in B in linear time complexity.
Note that when the count of a character c in B is x, then the count of c in the minimum window in A should be at least x.

Note:

• If there is no such window in A that covers all characters in B, return the empty string.
• If there are multiple such windows, return the first occurring minimum window ( with minimum start index and length )

Problem Constraints

1 <= size(A), size(B) <= 106

Input Format

The first argument is a string A.
The second argument is a string B.

Output Format

Return a string denoting the minimum window.

Example Input

Input 1:

``` A = "ADOBECODEBANC"
B = "ABC"```

Input 2:

``` A = "Aa91b"
B = "ab"```

Example Output

Output 1:

` "BANC"`

Output 2:

` "a91b"`

Example Explanation

Explanation 1:

` "BANC" is a substring of A which contains all characters of B.`

Explanation 2:

` "a91b" is the substring of A which contains all characters of B.`

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
Hints
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## Discussion

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