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11461 - Square Numbers Time limit: 1.000 seconds A square number is an integer number whose square root is also an integer. For example 1, 4, 81 are s 阅读全文
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12050 - Palindrome Numbers Time limit: 3.000 seconds A palindrome is a word, number, or phrase that reads the same forwards as backwards. For example, 阅读全文
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10339 - Watching Watches Time limit: 3.000 seconds It has been said that a watch that is stopped keeps better time than one that loses 1 second per da 阅读全文