Data Analyst

You are given a string 'STR' of lowercase English alphabets. You need to find the repeated character present first in the string.

Example:

If the string is: “abccba”, then the first repeated character is ‘c’, but the repeated character that is present first in the string is ‘a’. You need to print ‘a’.

Note:

Keep in mind that you need to print the repeated character that is present first in the string and not the first repeating character.

You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to return the list of all pairs of elements such that each sum of elements of each pair equals 'S'.

Note:

Each pair should be sorted i.e the first value should be less than or equals to the second value. 

Return the list of pairs sorted in non-decreasing order of their first value. In case if two pairs have the same first value, the pair with a smaller second value should come first.

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