杭锦泉的博客

Problem Description Zhu and 772002 are both good at math. One day, Zhu wants to test the ability of 772002, so he asks 772002 to solve a math problem.  But 772002 has a appointment with his girl

Problem Description Two planets named Haha and Xixi in the universe and they were created with the universe beginning. There is 73 days in Xixi a year and 137 days in Haha a year.  Now yo

Problem Description Lweb has a string S. Oneday, he decided to transform this string to a new sequence.  You need help him determine this transformation to get a sequence which has the longes