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May be you should read a book about C++

int main() {
    ifstream fs;
    const int tailleImage=3073;

    fs.open("F:\\Images\\cifar-10-batches-bin\\data_batch_1.bin",ios::binary);
    if (!fs.is_open())
        return 0;
   char *data=new char[tailleImage];
   for (int indexImage=25;indexImage<50;indexImage++)
    {
        fs.seekg(indexImage*tailleImage,ios::beg);
        char *data=new char[tailleImage];
        fs.read(data,tailleImage);

        Mat im(32,32,CV_8UC3);
        for (int i=0;i<im.rows;i++)
            for (int j=0;j<im.rows;j++)
                im.at<Vec3b>(i,j)=Vec3b(data[j+i*32],data[j+i*32+32*32],data[j+i*32+32*32*2]);
        imshow("CIFAR",im);
            waitKey(100);
    }
   delete data;
    return 0;
    }

May be you should read a book about C++

int main() {
    ifstream fs;
    const int tailleImage=3073;

    fs.open("F:\\Images\\cifar-10-batches-bin\\data_batch_1.bin",ios::binary);
    if (!fs.is_open())
        return 0;
   char *data=new char[tailleImage];
   for (int indexImage=25;indexImage<50;indexImage++)
    {
        fs.seekg(indexImage*tailleImage,ios::beg);
         fs.read(data,tailleImage);

        Mat im(32,32,CV_8UC3);
        for (int i=0;i<im.rows;i++)
            for (int j=0;j<im.rows;j++)
                im.at<Vec3b>(i,j)=Vec3b(data[j+i*32],data[j+i*32+32*32],data[j+i*32+32*32*2]);
        imshow("CIFAR",im);
            waitKey(100);
    }
   delete data;
    return 0;
    }