Invert a strings with special characters
Engineer Intern Interview Questions
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Given a string, I was asked to return all of the unique characters in the order of the original string.
A question about finding the shortest path between two points on a graph. With no information about where the second point was located in relation to the first problem.
Given a string and a pattern consisting of 'a's and 'b's check whether the string follows the pattern. Example: the string "catcatdogcatcat" follows the pattern "aabaa" bu substiting "a" as "cat" and "b' as "dog". Whereas the string "catdogcatcat" does not follow the pattern "aabaa" regardless of what is substituted for "a" and "b".
Given a graph, tell if it is a tree.
leetcode question with binary operators
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