Time: 7 ms (47.56%) | Memory: 44.4 MB (69.30%) - LeetSync

3-longest-substring-without-repeating-characters/longest-substring-without-repeating-characters.java

@@ -0,0 +1,15 @@
+class Solution {
+    public int lengthOfLongestSubstring(String s) {
+        Set<Character> ss = new HashSet<>();
+        int i = 0, ans = 0;
+        for (int j = 0; j < s.length(); ++j) {
+            char c = s.charAt(j);
+            while (ss.contains(c)) {
+                ss.remove(s.charAt(i++));
+            }
+            ss.add(c);
+            ans = Math.max(ans, j - i + 1);
+        }
+        return ans;
+    }
+}