摘要：这题就是在求阶乘后面的0，我第一次想的方法很简单，先乘出来然后在除10，肯定可以了。但是这个的时间复杂度超了 所以我们使用获取能被5整除的数字的方法来求值 其实是个数学问题，和你的编程能力没什么关系。。。 阅读全文

摘要：Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are n 阅读全文

摘要：Initially, there is a Robot at position (0, 0). Given a sequence of its moves, judge if this robot makes a circle, which means it moves back to the or 阅读全文

摘要：The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calcul 阅读全文