采用全选主元高斯－约当消去法求解复系数线性代数方程组。其中ar存放复系数矩阵实部，ai存放复系数矩阵虚部。br存放右端复常数向量实部，返回解向量实部；bi存放右端复常数向量虚部，返回解向量虚部。-With full pivoting Gauss- Jordan elimination method for solving linear algebraic equations with complex coefficients. Which ar stored real part of compl