原始单纯形法（大M法，无需给出初始基变量）。输入：C是n维行向量，A是m*n的系数矩阵，b是m维列向量

输出：x最优解（如果有的话），fval最优值，flag解的状态说明，interation求解时的循环次数-The original simplex method (big M method, without giving the initial basic variable). Input: C is the n-dimensional row vector, A is the coefficient matrix of m* n, b is the m-dimensional column vector　Output: x the optimal solution (if any), fval optimal value, flag state solution descr iption, interation when the number of cycles to solve