Question: Example 1 : Input: ABCDEFGABEF Explanation: The longest substring without repeating characters are ABCDEFG, Output: 7 BCDEFGA, and CDEFGAB with lengths of 7 Example 2

Example 1:
Input: "ABCDEFGABEF"
Explanation: The longest substring without repeating characters are "ABCDEFG",
Output: 7
"BCDEFGA", and "CDEFGAB" with lengths of 7
Example 2:
Input: "ABCABCBB"
Output: 3
Example 3:
Input: "FIFTYFIVE"
Output: 6
Example 1 : Input: "ABCDEFGABEF" Explanation: The

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