Description: Special strings are often encoded in data encryption and data compression. A given alphabet A is 26 small
Write letters in English composition A= {A, b,... , z}. The ascending string produced by the alphabet refers to the letter in the string from left to right
The sequence of the right appearance is the same as the sequence of letters appearing in the alphabet, and each character appears up to one time. For example,
A, b,ab, BC, xyz and other strings are ascending strings. For any ascending string that is not more than 6 in any length, the code in the above dictionary is calculated quickly.
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