Description Mr. Bender has a digital table of size n n, each cell can be switched on or off. He wants the field to have at least c switched on squares. When this condition is fulfilled, Mr Bender will be happy. Well consider the table rows numbered from…
描述 Institute of Computational Linguistics (ICL), Peking University is an interdisciplinary institute of science and liberal arts, it focuses primarily on the fundamental researches and applications of language information processing. The research of ICL …
描述 The history of Peking University Library is as long as the history of Peking University. It was build in 1898. At the end of year 2015, it had about 11,000 thousand volumes of books, among which 8,000 thousand volumes were paper books and the others w…
描述 Profess X is an expert in signal processing. He has a device which can send a particular 1 second signal repeatedly. The signal is A0 ... An-1 under n Hz sampling. One day, the device fell on the ground accidentally. Profess X wanted to check whether …
描述 There are two antagonistic countries, country A and country B. They are in a war, and keep launching missiles towards each other. It is known that country A will launch N missiles. The i-th missile will be launched at time Tai. It flies uniformly and …