Given a string S consisting of lowercase alphabets. The task is to find the lexicographically smallest string X of the same length only that can be formed using the operation given below:
In a single operation, select any one character among the at most first K characters of string S, remove it from string S and append it to string X. Apply this operation as many times as he wants.
Input: str = “gaurang”, k=3
Remove ‘a’ in the first step and append to X.
Remove ‘g’ in the second step and append to X.
Remove ‘a’ in the third step and append to X.
Remove ‘n’ in the third step and append to X.
Pick the lexicographically smallest character at every step from the first K characters to get the
Input: str = “geeksforgeeks”, k=5
- Find the smallest character in the first k characters in the string S.
- Delete the smallest character found from the string.
- Append the smallest character found to the new string X.
- Repeat the above steps till the string s is empty.
Below is the implementation of the above approach:
- Lexicographically smallest string formed by appending a character from first K characters of a string | Set 2
- Lexicographically smallest string formed by removing at most one character
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- Check whether second string can be formed from characters of first string
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- Lexicographically next greater string using same character set
- Lexicographically smallest string of length N and sum K
- Queries to answer the X-th smallest sub-string lexicographically
- Lexicographically smallest permutation of a string with given subsequences
- K-th lexicographically smallest unique substring of a given string
- Lexicographically smallest string obtained after concatenating array
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