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Given an input string, print the index of the first character in the string that does not occur multiple times in the string. If all characters occur multiple times, print "-1". For example, if the user inputs "anac102", your code should print 1 because the first non-repeating character is "s".

Given an input string, print the index of the first character in the string that does not occur multiple times in the string. If all characters occur multiple times, print "-1". For example, if the user inputs "anac102", your code should print 1 because the first non-repeating character is "s".

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Problem Statement

Given an input string, print the index of the first character in the string that does not occur multiple times in the string. If all characters occur multiple times, print "-1".

For example, if the user inputs "anac102", your code should print 1 because the first non-repeating character is "s".

Sample Input

asac102

Sample Output

1

Sample Input

bobo

Sample Output

-1

Expert Solution
Step 1

Here, two methods are used. 

countCharacters method determines the count of characters in a string.

firstNonRepeatingChar method returns the index of the first character in the string that does not occur multiple times in the string, otherwise returns -1. The method calls the countCharacters method to check whether a character is repeated or not in a string. 

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