InterviewBit Problems   Longest Substring Without Repeat : Unsolved

About the Longest Substring Without Repeat : Unsolved category (1)
How to convert *char into string (1)
Help me with editorial solution (1)
Debug statements (3)
Please help with the error, getting a wrong answer please see (1)
Worst Problem considers lower case and uppercase different (1)
Completed in O(n) but still showing partial correct due to TLE (3)
It fails a particular test case, can someone have a look (1)
Please check what is wrong in this code (2)
More of a two pointer question than a hashing question (1)
O(n) getting TLE (1)
String characters can be alphanumeric (2)
Showing wrong answer fo a test case otherwise its O(n) solution (1)
Python3 Test Cases should be modified to avoid Segmentation Fault (2)
Is 'G' and 'g' considered same in the case of repeating characters, for this ques (2)
Seg fault using large string python (2)
Input= "dadbc" expected output= "4" should it not be 2, since d is repeating at t (5)
Segmentation Fault (4)
Python gives segfault (3)
Can the given string not contain numbers? (1)
Expected solution is wrong! (1)
Bug in python checker (3)
Function returns different value when testing vs submitting (1)
Need of definition of charset (1)
Broken "expected output" for some strings (1)
As usual, even editorial solution in Python gives segmentation fault! (1)
Please fix the Python sandbox in the backend (1)
My O(n^2) solution(assuming unordered map takes O(1) time for lookup and insert) (2)