Given a string str containing lower case alphabets and character ‘?’. The task is to check if it is possible to make str good or not.
A string is called good if it contains a sub-string of length 26 which has every character of lower case alphabets in it.
The task is to check if it is possible to make the string good by replacing ‘?’ characters with any lower case alphabet. If it is possible then print the modified string otherwise print -1.
Input: str = “abcdefghijkl?nopqrstuvwxy?”
Replace first ‘?’ with ‘m’ and second with ‘z’.
Input: str = “abcdefghijklmnopqrstuvwxyz??????”
Given string already has a sub-string which contains all the 26 lower case alphabets.
Approach: If the length of the string is less than 26 then print -1. The Task is to make a sub-string of length 26 that has all the lowercase characters. Thus, the simplest way is to iterate through all sub-strings of length 26 then for each sub-string count the number of occurrences of each alphabet, ignoring the question marks. After that, if there exists a character that occurs twice or more then this sub-string cannot contain all letters of the alphabet, and we process the next sub-string. Otherwise, we can fill in the question marks with the letters that have not appeared in the sub-string and obtain a sub-string of length 26 which contains all letters of the alphabet.
Below is the implementation of the above approach:
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- Check if at least half array is reducible to zero by performing some operations
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