Given a string str containing only characters 0, 1 and 2, you can swap any two adjacent (consecutive) characters 0 and 1 or any two adjacent (consecutive) characters 1 and 2. The task is to obtain the minimum possible (lexicographically) string by using these swaps arbitrary number of times.
Input: str = “100210”
We can swap 0 and 1 OR we can swap 1 and 2. Swapping 0 and 2 is not allowed. All the swaps can happen for adjacent only.
Input: str = “2021”
Note that 0 and 2 cannot be swapped
Approach: You can print all the 1s together as 1 can be swapped with either of the other characters while 0 and 2 can not be swapped, so all the 0s and 2s will follow the same order as the original string.
Below is the implementation of the above approach:
- Generate permutations with only adjacent swaps allowed
- Minimum number of adjacent swaps to convert a string into its given anagram
- Lexicographically smallest string formed by appending a character from first K characters of a string | Set 2
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- Lexicographically smallest string of length N and sum K
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- Queries to answer the X-th smallest sub-string lexicographically
- Lexicographically smallest permutation of a string with given subsequences
- Lexicographically smallest string obtained after concatenating array
- Swap all occurrences of two characters to get lexicographically smallest string
- Lexicographically smallest string formed by removing at most one character
- Find the lexicographically smallest string which satisfies the given condition
- Form lexicographically smallest string with minimum replacements having equal number of 0s, 1s and 2s
- Smallest length string with repeated replacement of two distinct adjacent
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