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 ...
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