摘要：
You are given several logs that each log contains a unique id and timestamp. Timestamp is a string that has the following format: Year:Month:Day:Hour: 阅读全文
posted @ 2017-07-02 19:54
hellowOOOrld
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摘要：
Given a non-negative integer c, your task is to decide whether there're two integers a and b such that a2 + b2 = c. Example 1: Example 2: 思路： 类似于二分查找。 阅读全文
posted @ 2017-07-02 12:06
hellowOOOrld
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In combinatorial mathematics, a derangement is a permutation of the elements of a set, such that no element appears in its original position. There's 阅读全文
posted @ 2017-07-02 11:45
hellowOOOrld
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