vector2D_loop_1.cpp

#include <iostream>
#include <vector>
using namespace std;

int main() {
    vector<vector <int>> tab = {{1, 2, 3}, {4, 5, 6}};

    for(int i=0; i< tab.size(); i++) {
        int s = 0;
        for(int j=0; j<tab[i].size();j++) {
            s = s + tab[i][j];
        }
        cout << s << endl;
    }
}