// Given a string s, find the length of the longest substring without repeating characters. // Explanation: The answer is "wke", with the length of 3. // Notice that the answer must be a substring, ...

//for array len=a.length...for str len=s.length()..."()"this fun symbol use is necessary /*arr.length here .length is a field... In Java, a field refers to a variable that is a member of a class or an ...