摘要：
题目 In this term, Alice took nn courses. Now, she has finished all final exams, and she will get her grades in the following nn days. On the i-th day, 阅读全文
摘要：
题目 a 题意 给出n个不同的数，如果这n个数有四个异或起来等于0，就是YES，如果一组都没有就是NO。 思路 考虑 a ^ b = c , 每次把两两异或后的值记录为1，如果有一个数记录了2次，即有两组数异或起来相等，由于这n个数都是不同的数，所以不可能存在ab=c && ad=c 的情况，所以必 阅读全文
摘要：
2020 is a special integer, it's formed of two same integers (20 and 20). We call a number is a good number, if and only if it can be formed of two sam 阅读全文
摘要：
题目 As a world-famous traveler, Prof. Pang's research interest is to travel as many places as possible in his life. We have a segment {[0, n]}[0,n]. Th 阅读全文
摘要：
题目 Your git project (you don't need to be familiar with git to solve this problem) has some files that should be ignored from synchronizing. You need 阅读全文
摘要：
题目 A mine-sweeper map X can be expressed as an n\times mn×m grid. Each cell of the grid is either a mine cell or a non-mine cell. A mine cell has no n 阅读全文
摘要：
题目 In mathematics, the Fibonacci numbers, commonly denoted as f_nf n , is a sequence such that each number is the sum of the two preceding numbers, 阅读全文