In C++

int main() {

vector<vector<int>> arr(6);

int maxHourGlassSum = -63;

for (int i = 0; i < 6; i++) {
    arr[i].resize(6);

    string arr_row_temp_temp;
    getline(cin, arr_row_temp_temp);

    vector<string> arr_row_temp = split(rtrim(arr_row_temp_temp));

    for (int j = 0; j < 6; j++) {
        int arr_row_item = stoi(arr_row_temp[j]);

        arr[i][j] = arr_row_item;
    }
}

for(int i = 0; i < 4; i++) {
    for (int j = 0; j < 4; j++) {

        int hourGlassSum = arr[i][j] + arr[i][j+1] + arr[i][j+2] + arr[i+1][j+1] + arr[i+2][j] + arr[i+2][j+1]+ arr[i+2][j+2];

        maxHourGlassSum = max(maxHourGlassSum, hourGlassSum);
    }
}

cout << maxHourGlassSum;

return 0;

}