用VC++实现的简易解方程器，可以解一元一次/二次/二元一次方程，此外还提供了分解质因数/最大公约数/最小公倍数/阶乘等功能。-A simple Equation Solver with VC++, which can solve linear equation with one or two unknown and also quadratic equation with one unknown, in addition to providing a series of functions s

是推荐系统中最基础的MF实现程序，使用梯度下降的方法，用迭代优化的方式找到最优解-Recommendation system is the most basic MF realize procedure, using a gradient descent method, using an iterative optimization approach to find the optimal solution