随笔分类 -  构造题目

摘要：Consider an n \times mn×m matrix of ones and zeros. For example, this 4 \times 44×4: \displaystyle \begin{matrix} 1 & 1 & 1 & 1 \\ 0 & 1 & 1 & 1 \\ 0 阅读全文

摘要：D. Vasya And The Matrix time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output D. Vasya And The 阅读全文

摘要：Method ringing is used to ring bells in churches, particularly in England. Suppose there are 6 bells that have 6 different pitches. We assign the numb 阅读全文