Given a string, find if it is possible to convert it to a string that is repetition of substring with k characters. To convert, we can replace one substring of length k with k characters.
Input: str = "bdac", k = 2 Output: True We can either replace "bd" with "ac" or "ac" with "bd". Input: str = "abcbedabcabc", k = 3 Output: True Replace "bed" with "abc" so that the whole string becomes repetition of "abc". Input: str = "bcacc", k = 3 Output: False k doesn't divide string length i.e. 5%3 != 0 Input: str = "bcacbcac", k = 2 Output: False Input: str = "bcdbcdabcedcbcd", k = 3 Output: False
This can be used in compression. If we have a string where complete string is repetition except one substring, then we can use this algorithm to compress the string.
One observation is, length of string must be a multiple of k as we can replace only one substring.
The idea is declare a map mp which maps strings of length k to an integer denoting its count. So, if there are only two different sub-strings of length k in the map container and count of one of the sub-string is 1 then answer is true. Otherwise answer is false.
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