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模拟ATM（自动柜员机）界面 求解二维数组的最大或最小元素 对数组元素排序 二维数组实现矩阵转置 乘法口诀表-Simulation of ATM (automatic teller machine) interface the maximum or minimum element in solving the two-dimensional array sort the array element to achieve a two-dimensional array matrix tran