print vector of vector c++
#include <iostream>
#include <vector>
int main() {
std::vector<std::vector<int>> matrix = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
for (const auto& row : matrix) {
for (const auto& val : row) {
std::cout << val << " ";
}
std::cout << std::endl;
}
return 0;
}