Create Longest_Substring_Without_Repeating_Characters.cpp #12
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Added a new solution file Longest_Substring_Without_Repeating_Characters.cpp, which implements a C++ program to find the length of the longest substring without repeating characters in a given string. This program uses a sliding window approach along with a hash map to store the last seen index of each character, allowing for efficient tracking of unique substrings.
The code takes user input for the string and outputs the maximum length of any substring without duplicate characters. Comments and an example are included for clarity.