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Submit Status Description Today on a lecture about strings Gerald learned a new definition of string equivalency. Two strings a and b of equal length 阅读全文
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Description A ring is composed of n (even number) circles as shown in diagram. Put natural numbers into each circle separately, and the sum of numbers 阅读全文
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Description Write a program that finds and displays all pairs of 5-digit numbers that between them use the digits 0 through 9 once each, such that the 阅读全文