我们能用std::vector定义一个固定宽度的2D矩阵吗？

#include <iostream>
#include <vector>

int main() {
    int width = 3;
    int height = 4;

    std::vector<std::vector<int>> matrix(height, std::vector<int>(width));

    // 初始化矩阵
    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            matrix[i][j] = i * width + j;
        }
    }

    // 打印矩阵
    for (int i = 0; i < height; i++) {
        for (int j = 0; j < width; j++) {
            std::cout << matrix[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}