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A crossword puzzle consists of a rectangular grid of black and white squares and two lists of definitions (or descriptions).One list of definitions is... 阅读全文
posted @ 2015-06-09 14:31
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A children's puzzle that was popular 30 years ago consisted of a 5x5 frame which contained 24 small squares of equal size. A unique letter of the alph... 阅读全文
posted @ 2015-06-09 13:02
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A character string is said to have periodkif it can be formed by concatenating one or more repetitions of another string of lengthk. For example, the ... 阅读全文
posted @ 2015-06-09 01:05
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Trung is bored with his mathematics homeworks. He takes a piece of chalk and starts writing a sequence of consecutive integers starting with 1 toN(1 #... 阅读全文
posted @ 2015-06-09 00:15
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