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Description It is well-known that for any n there are exactly four n-digit numbers (including ones with leading zeros) that are self-squares: the last 阅读全文
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Square Number: Description In mathematics, a square number is an integer that is the square of an integer. In other words, it is the product of some i 阅读全文
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字符串距离 题目: 给出两个相同长度的由字符 a 和 b 构成的字符串,定义它们的距离为对应位置不同的字符的数量。如串”aab”与串”aba”的距离为 2;串”ba”与串”aa”的距离为 1;串”baa”和串”baa”的距离为 0。下面给出两个字符串 S 与 T,其中 S 的长度不小于 T 的长度。 阅读全文