Check if a string is Isogram or not
Basic Accuracy: 55.24% Submissions: 13366 Points: 1

Given a string S of lowercase alphabets, check if it is isogram or not. An Isogram is a string in which no letter occurs more than once.

Example 1:

S = machine
Output: 1
Explanation: machine is an isogram
as no letter has appeared twice. Hence
we print 1.

Example 2:

S = geeks
Output: 0
Explanation: geeks is not an isogram
as 'e' appears twice. Hence we print 0.

Your Task:
This is a function problem. You only need to complete the function isIsogram() that takes a string as a parameter and returns either true or false.

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(Number of distinct characters).
Note: N = |S|

1 <= |s| <= 103


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