在n行n列(n<=10)的二维整数数组中，按照以下要求选出一个数。首先从每行中选出最大数，再从选出的n个最大数中选出最小数. 程序运行示例: Please enter the order of the matrix:3 Please input the elements of the matrix: 9 2 3 4 5 8 7 2 1 The minimum of maximum number is 7. 输入提示："Please enter the order of the matrix:" 输入格式：%d 输入提示："Please input the elements of the matrix:\n" 输入格式：%d 输出提示："The minimum of maximum number is %d.\n"

以下是实现该功能的 C++ 代码：

#include <iostream>
using namespace std;

int main() {
    int n, max_num, min_max_num;
    cout << "Please enter the order of the matrix:";
    cin >> n;
    int matrix[n][n];
    cout << "Please input the elements of the matrix:" << endl;
    // 读入矩阵
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            cin >> matrix[i][j];
        }
    }
    // 找出每行最大值
    int row_max[n];
    for (int i = 0; i < n; i++) {
        max_num = matrix[i][0];
        for (int j = 1; j < n; j++) {
            if (matrix[i][j] > max_num) {
                max_num = matrix[i][j];
            }
        }
        row_max[i] = max_num;
    }
    // 找出最大值中的最小值
    min_max_num = row_max[0];
    for (int i = 1; i < n; i++) {
        if (row_max[i] < min_max_num) {
            min_max_num = row_max[i];
        }
    }
    cout << "The minimum of maximum number is " << min_max_num << "." << endl;
    return 0;
}

输入示例:

Please enter the order of the matrix:3
Please input the elements of the matrix:
9 2 3
4 5 8
7 2 1

输出示例:

The minimum of maximum number is 7.