int main()
{
    setlocale(LC_ALL,"Russian");
    int **a, i, j,k=-1;
    a = (int**) malloc(n * sizeof(int*));
    for (i = 0; i < n; i++)
        a[i] = (int*) malloc(m * sizeof(int));
    srand(time(NULL));

    for (i=0; i<n; i++)
        for(j=0; j<m; j++)
            a[i][j] = (rand() - rand()) %10;

    printf("Первоначальная матрица\n");
    vivod(a,n,m);
    printf("_____________________________\n");

    for (i = 0; i <n ; i++)
        for (j = 0; j < m; j++)
            if ((a[i][j-1]*a[i][j-1]==a[i][j] && a[i][j+1]*a[i][j+1]==a[i][j] && k==-1&&j>0 && j<2 ) || (a[i][j-1]*a[i][j-1]==a[i][j] && k==-1 && j==2) || (a[i][j+1]*a[i][j+1]==a[i][j] && k==-1 && j==0))
                k = i;
    if(k==-1)
    {
        printf("\nподходящих строк не найдено!\n");
    }