Initializing a two dimensional std::vector

Definition:std::vector< std::vector > fog;
Initialization:
not good one

    for(int i=0; istd::vector <int> fogRow;
            for(int j=0; j0 );
            }
            fog.push_back(fogRow);
    }

recommend:
Use the std::vector::vector(count, value) constructor that accepts an initial size and a default value:

std::vector<std::vector<int>> fog(
    A_NUMBER,
    std::vector<int>(OTHER_NUMBER)); // Defaults to zero initial value

If a value other zero, say 4 for example, was required to be the default then:

std::vector<std::vector<int>> fog(
    A_NUMBER,
    std::vector<int>(OTHER_NUMBER, 4));

And just to mention uniform initialization introduced in c++11, which permits the initialization of vector, and other containers, using {}:

std::vector<std::vector<int>> fog { { 1, 1, 1 },
                                    { 2, 2, 2 } };