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Given a string s, find the length of the longest substring without repeating characters.
Given an encoded string, return its decoded string.
Given an input string `s`, reverse the order of the words without reversing the words themselves.
Given a 32-bit signed integer, reverse digits of the integer.
Given `n` pairs of parentheses, write a function to generate all combinations of well-formed parentheses.
You are given a path to a file as a string. The path can contain the symbols: “..” for the parent directory and “.” for the current directory. Convert the path into its simplified form.
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