You are given a binary string s and a positive integer k.
A substring of s is beautiful if the number of 1's in it is exactly k.
Let len be the length of the shortest beautiful substring.
Return the lexicographically smallest beautiful substring of string s with length equal to len. If s doesn't contain a beautiful substring, return an empty string.
A string a is lexicographically larger than a string b (of the same length) if in the first position where a and b differ, a has a character strictly larger than the corresponding character in b.
"abcd" is lexicographically larger than "abcc" because the first position they differ is at the fourth character, and d is greater than c.\n
Example 1:
\n\n\nInput: s = "100011001", k = 3\nOutput: "11001"\nExplanation: There are 7 beautiful substrings in this example:\n1. The substring "100011001".\n2. The substring "100011001".\n3. The substring "100011001".\n4. The substring "100011001".\n5. The substring "100011001".\n6. The substring "100011001".\n7. The substring "100011001".\nThe length of the shortest beautiful substring is 5.\nThe lexicographically smallest beautiful substring with length 5 is the substring "11001".\n\n\n
Example 2:
\n\n\nInput: s = "1011", k = 2\nOutput: "11"\nExplanation: There are 3 beautiful substrings in this example:\n1. The substring "1011".\n2. The substring "1011".\n3. The substring "1011".\nThe length of the shortest beautiful substring is 2.\nThe lexicographically smallest beautiful substring with length 2 is the substring "11".\n\n\n
Example 3:
\n\n\nInput: s = "000", k = 1\nOutput: ""\nExplanation: There are no beautiful substrings in this example.\n\n\n
\n
Constraints:
\n\n1 <= s.length <= 1001 <= k <= s.lengthi is the leftmost index of a beautiful substring, it has only one candidate j, such that s[i:j] is beautiful and shortest too.",
"We can iterate over all possibilities of leftmost index i take s[i:j] and compare with the shortest and the lexicographically smallest beautiful string we could get before index i."
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