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package misc;

import java.util.HashSet;

import java.util.Set;

public class LongestSubstring {

String getUniqueCharacterSubstringBruteForce(String input) {

String output = "";

for (int start = 0; start < input.length(); start++) {

Set<Character> visited = new HashSet<>();

int end = start;

for (; end < input.length(); end++) {

char currChar = input.charAt(end);

if (visited.contains(currChar)) {

break;

} else {

visited.add(currChar);

}

if (output.length() < end - start + 1) {

output = input.substring(start, end);

}

return output;

}

public static void main(String[] args) {

String input = "ABDEFGABEF";

LongestSubstring obj = new LongestSubstring();

System.out.println("Longest Substring: " + obj.getUniqueCharacterSubstringBruteForce(input));

}