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    The solution does not go beyond four or five elementary operations, so it is quite an introductory problem, which is fine. But the question description is so horribly written. It's like reading someone's notebook that is written with a pseudo-language that only the author understands. Where's the introduction? What's the matter with xor? Because ^ is pretty cool? In the description it is said that query is made of string, but in the code it's a double vector of int out of nowhere, why?