题解 | #创建二维动态数组#

#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;

    vector<vector<int>> arr(n, vector<int>(n));

for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j){
        arr[i][j] = i + j;
    }
}

for (const auto &row : arr) {
    for (int num : row) {
        cout << num << ' ';
    }
    cout << endl;
}

return 0;

}