摘要： Description Here is a famous story in Chinese history. That was about 2300 years ago. General Tian Ji was a high official in the country Qi. He likes... 阅读全文

摘要： DescriptionWLD likes playing with numbers. One day he is playing with $N$ integers. He wants to delete $K$ integers from them. He likes diversity, so ... 阅读全文

摘要： DescriptionA factory produces products packed in square packets of the same height h and of the sizes 1*1, 2*2, 3*3, 4*4, 5*5, 6*6. These products are... 阅读全文