Longest Substring Without Repeating Characters

Given a string s, find the length of the longest substring without repeating characters.

- 0 <= s.length <= 5 * 10^4
- s consists of English letters, digits, symbols and spaces.

Input: s = "abcabcbb"

Output: 3

The answer is "abc", with the length of 3.

Input: s = "bbbbb"

Output: 1

The answer is "b", with the length of 1.

Case 1 Input: "abcabcbb"

Expected: 3

Case 2 Input: "bbbbb"

Expected: 1

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Case 1 Input: "abcabcbb"

Expected: 3

Case 2 Input: "bbbbb"

Expected: 1