Question 3:

Given a string s,

1. Find the length of the longest substring without repeating characters in java

2. Evaluate the time complexity of your code

Example 1:

Input: s = "abcabcbb" Output: 3

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

Example 2:

Input: s = "bbbbb" Output: 1

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

Example 3:

Input: s = "pwwkew" Output: 3

Explanation: The answer is "wke", with the length of 3.

Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.

Example 4:

Input: s = ""Output: 0

Constraints:

• 0 <= s.length <= 5 * 104

• s consists of English letters, digits, symbols and spaces.