A registration card number of PAT consists of 4 parts:the 1st letter represents the test level, namely,Tfor the top level,Afor advance andBfor basic;the 2nd - 4th digits are the test site nu...

描述Sudoku is a very simple task. A square table with 9 rows and 9 columns is divided to 9 smaller squares 3x3 as shown on the Figure. In some of the cells are written decimal digits from 1 to 9. The ..

原来>>conda install 包改用>>pip install 包