#Length of longest substring. this is one of the data structure and algorithm problem. hash map is very use full in terms of saving the and retrieving data. I made #the code very clear and and explain ...

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. Constraints: 0 ...