Have fun and draw many shapes with numbers in console -Have fun and draw many shapes with numbers in console !!

用C++实现一个具体事例，形状作为基类，正方形，三角形等等作为派生类。来体现类的多态性，其中涉及多态，继承，虚函数的使用。-using a C++ example to illustrate polymorphism, virtual function and etc. The example has a base class of shape, and many concrete shapes as derived classes.

设计算法解决拉丁矩阵问题，将n种不同形状的宝石排列成m行n列的一个矩阵，每一行每一列的宝石都没有相同形状，求宝石排列方案数(Latin matrix design algorithm to solve the problem, the gem n different shapes arranged in m rows n columns of a matrix, each row of each column of gems don't have the same shape, strives