利用遗传算法寻找下列多元函数的最大值：输出最优解、最优解对应的x和y值，以及遗传算法迭代过程中的适应度函数进化曲线。

-Maximum use of genetic algorithm to find the following multivariate function: output the optimal solution, x and y values ​ ​ corresponding to the optimal solution, and genetic algorithm iterative process of evolutionary adaptation function curve.