摘要：题意： 大概就是给你一串二进制的数，然后让你求log(4)s吧，刚开始找错方向，先把它转成十进制，结果数太大 解决方法： 大概是分析这个数如果正好是4的幂次方的话在二进制的表示里应该只有一个1，所以分析数的长度就可以 阅读全文

摘要：You are given two strings ss and tt both of length 22 and both consisting only of characters 'a', 'b' and 'c'. Possible examples of strings ss and tt 阅读全文

摘要：The only difference between easy and hard versions is the number of elements in the array. You are given an array aa consisting of nn integers. In one 阅读全文