Given a string S. The task is to print the K-th lexicographically smallest one among the different substrings of s.
A substring of s is a string obtained by taking out a non-empty contiguous part in s.
For example, if s = ababc, a, bab and ababc are substrings of s, while ac, z and an empty string are not. Also, we say that substrings are different when they are different as strings.
Input: str = “aba”, k = 4
All unique substrings are a, ab, aba, b, ba.
Thus the 4th lexicographically smallest substring is b.
Input: str = “geeksforgeeks”, k = 5
Approach: For an arbitrary string t, each of its proper suffix is lexicographically smaller than t, and the lexicographic
rank of t is at least |t|. Thus, the length of the answer is at most K.
Generate all substrings of s whose lengths are at most K. Sort them, unique them, and print the K-th one, where N = |S|.
Below is the implementation of the above approach:
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