Longest Substring Without Repeating Characters
Problem link - Longest Substring Without Repeating Characters
Given a string s
, find the length of the longest substring without repeating characters.
Example 1:
Input: s = "abcabcbb"
Output: 3
Explanation: The answer is "abc", with the length of 3.
Example 2:
Input: s = "bbbbb"
Output: 1
Explanation: The answer is "b", with the length of 1.
Example 3:
Input: s = "pwwkew"
Output: 3
Explanation: The answer is "wke", with the length of 3.
Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.
Solution
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | class Solution { public int lengthOfLongestSubstring(String s) { int right = 0; int left = 0; Set<Character> set = new HashSet<>(); int maxLength = 0; while (left < s.length() && right < s.length()) { if (!set.contains(s.charAt(right))) { set.add(s.charAt(right)); maxLength = Math.max(maxLength, set.size()); right++; } else { set.remove(s.charAt(left)); left++; } } return maxLength; } } |
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