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struct Element
{
   float x; 
   float y; 
};

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float matrix[m][n];

    for (int i = 0; i < m; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if((i+1 == m) || (j+1 == n))
            {
                matrix[i][j] = Element2;
            }
            else
            {
                matrix[i][j] = Element1;
            }
        }
    }