将矩阵(2d-std::vector)旋转90°

#include <iostream>
#include <vector>

// 定义一个函数来旋转矩阵
std::vector<std::vector<int>> rotateMatrix(std::vector<std::vector<int>>& matrix) {
    int n = matrix.size(); // 获取矩阵的大小

    // 创建一个新的矩阵
    std::vector<std::vector<int>> rotatedMatrix(n, std::vector<int>(n, 0));

    // 进行矩阵旋转
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            rotatedMatrix[j][n - i - 1] = matrix[i][j];
        }
    }

    return rotatedMatrix;
}

int main() {
    // 创建一个示例矩阵
    std::vector<std::vector<int>> matrix = {{1, 2, 3},
                                            {4, 5, 6},
                                            {7, 8, 9}};

    // 调用旋转矩阵函数
    std::vector<std::vector<int>> rotatedMatrix = rotateMatrix(matrix);

    // 输出旋转后的矩阵
    for (int i = 0; i < rotatedMatrix.size(); i++) {
        for (int j = 0; j < rotatedMatrix[i].size(); j++) {
            std::cout << rotatedMatrix[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}

7 4 1 
8 5 2 
9 6 3