如何在C++中将整数数组向量转换为二维数组？

#include <vector>
#include <iostream>

std::vector<int> intVector = {1, 2, 3, 4, 5, 6, 7, 8, 9};

int rows = 3;
int cols = 3;

std::vector<std::vector<int>> intArray(rows, std::vector<int>(cols));

int index = 0;
for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
        intArray[i][j] = intVector[index];
        index++;
    }
}

for (int i = 0; i < rows; i++) {
    for (int j = 0; j < cols; j++) {
        std::cout << intArray[i][j] << " ";
    }
    std::cout << std::endl;
}

#include <vector>
#include <iostream>

int main() {
    std::vector<int> intVector = {1, 2, 3, 4, 5, 6, 7, 8, 9};
    int rows = 3;
    int cols = 3;

    std::vector<std::vector<int>> intArray(rows, std::vector<int>(cols));

    int index = 0;
    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            intArray[i][j] = intVector[index];
            index++;
        }
    }

    for (int i = 0; i < rows; i++) {
        for (int j = 0; j < cols; j++) {
            std::cout << intArray[i][j] << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}