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Shortest substring with all characters

Moderate
0/80
Average time to solve is 18m
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Asked in companies
JP MorganAmazonCisco

Problem statement

You have been given a string 'S' which only consists of lowercase English-Alphabet letters.

Your task is to find the shortest(minimum length) substring of 'S' which contains all the characters of 'S' at least once. If there are many substrings with the shortest length, then find one which appears earlier in the string i.e. substring whose starting index is lowest.

For example-
If the given string is S = "abcba", then the possible substrings are "abc" and "cba". As "abc" starts with a lower index (i.e. 0, "cba" start with index 2), we will print "abc" as our shortest substring that contains all characters of 'S'.
Detailed explanation ( Input/output format, Notes, Images )
Constraints:
1 <= N <= 10^5
'S' only contains lowercase English-Alphabet letters.

Where 'S' is the given string and ‘N’ is the length of ‘S’.

Time Limit: 1 sec 
Sample Input 1:
aabcabb
Sample Output 1:
abc
Explanation of Sample Input 1:
Some of the possible substrings are "aabcabb", "aabc", "abcab", "abc", etc. Out of all these substrings, we will have "abc", "bca" and "cab" with the shortest length. As "abc" appear earliest in the string, we will print "abc" in the output.
Sample Input 2:
cddeyys
Sample Output 2:
cddeyys
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