Comments (2)
import java.util.HashMap;
public class LongestSubstringWithoutRepeatingChars {
public static String findLongestSubstring(String s) {
if (s == null || s.length() == 0) {
return "";
}
int maxLength = 0;
int start = 0;
int end = 0;
int currentStart = 0;
HashMap<Character, Integer> charIndexMap = new HashMap<>();
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (charIndexMap.containsKey(c) && charIndexMap.get(c) >= currentStart) {
currentStart = charIndexMap.get(c) + 1;
}
charIndexMap.put(c, i);
if (i - currentStart > maxLength) {
maxLength = i - currentStart;
start = currentStart;
end = i;
}
}
return s.substring(start, end + 1);
}
public static void main(String[] args) {
String input = "abcabcbb";
String longestSubstring = findLongestSubstring(input);
System.out.println("Longest substring without repeating characters: " + longestSubstring);
}
}
from java-se-tutorial-codeswithpankaj.
public class LongestSubstringWithoutRepeatingChars {
public static String findLongestSubstring(String s) {
if (s == null || s.isEmpty()) {
return "";
}
int n = s.length();
int maxLength = 0;
int start = 0;
int end = 0;
int[] charIndex = new int[256]; // Assuming ASCII characters
for (int i = 0, j = 0; j < n; j++) {
char currentChar = s.charAt(j);
i = Math.max(charIndex[currentChar], i);
if (j - i + 1 > maxLength) {
maxLength = j - i + 1;
start = i;
end = j;
}
charIndex[currentChar] = j + 1;
}
return s.substring(start, end + 1);
}
public static void main(String[] args) {
String input = "abcabcbb";
String longestSubstring = findLongestSubstring(input);
System.out.println("Longest substring without repeating characters: " + longestSubstring);
}
}
from java-se-tutorial-codeswithpankaj.
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from java-se-tutorial-codeswithpankaj.