link:https://leetcode.com/problems/longest-substring-without-repeating-characters/
public class LongestSubstringWithoutRepeatingCharacters {
/**
* Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length
* of 3.
*
* @param s
* @return
*/
public static int lengthOfLongestSubstring(String s) {
int len = 0;
if (s == null)
return len;
char[] ch = s.toCharArray();
Set<Character> set = new HashSet<>();
int p = 0, q = 0;
while (q < ch.length) {
if (!set.contains(ch[q])) {
set.add(ch[q]);
q++;
len = Math.max(len, set.size());
} else {
set.remove(ch[p]);
p++;
}
}
return len;
}
public static void main(String[] args) {
System.out.println(lengthOfLongestSubstring("abcabcbb"));
System.out.println(lengthOfLongestSubstring("bbbbbb"));
}
}
Longest Substring Without Repeating Characters
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