i think we cannot change the order of the characters On Thursday, 19 July 2012 11:00:20 UTC+5:30, gobind hemb wrote: > > String s is called *unique* if all the characters of s are different. > > String s2 is *producible* from string s1, if we can remove some > characters of s1 to obtain s2. > > String s1 is *more beautiful* than string s2 if length of s1 is more than > length of s2 or they have equal length and s1 is lexicographically greater > than s2. > > Given a string s you have to find the *most beautiful unique* string that > is producible from s. > > *Input:* > > First line of input comes a string s having no more than 1,000,000(10^6) > characters. all the characters of s are lowercase english letters. > > *Output:* > > Print the most beautiful unique string that is producable from s > > *Sample Input:* > > babab > > *Sample Output:* > > ba > > *Explanation* > > In the above test case all unique strings that are producible from s are > "ab" and "ba" and "ba" is more beautiful than "ab". >
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