why did bhaiya do -> i-current_len > last_occ
i mean what does it mean??
(line 25)
What is the meaning
i means you current position in the sting.
i-current_len > last_occ is basically to check that if the current character is not present in the current window. last_occ is the position/index at which current character last occured. i-current_len is the position from where your current window starts. You have to ensure that no duplicate character occurs in a window. This is why we do this check
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