Given a string, find concatenation of all substrings in lexicographic order.
Input : s = “abc”
Output : aababcbbcc
The substrings of s in lexicographic order are “a”, “b”, “c”, “ab”, “abc”, “bc”. Concatenation of substrings is “a”+”ab”+”abc”+”b”+”bc”+”c” = “aababcbbcc”.
Input : s = “cba”
Output : abbaccbcba
1. Find all the substrings of string and store it in a string array. The size of array would be n*(n+1)/2 where n is length of input string.
2. Sort the string array to make them all in lexicographical order.
3. Concatenate the strings of string array in another empty string.
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