The substring() method in Java is a powerful tool for extracting portions of a string. It allows you to create a new string based on the characters within a specified range of an existing string.

// Time Complexity: O(n²) (due to substring creation and window reset) } else if (right == s.length() - 1 && !(map.containsKey(s.substring(left, right + 1)))) { map ...

Java String.split (String) on regular expression with one or more whitespace characters provides “events” for the nominal case (when “events” really is the last characters in the provided String) and ...