/// <summary>
/// Возвращает результат умножения многочленов.
/// </summary>
/// <param name="First"></param>
/// <param name="Second"></param>
/// <returns></returns>
public static Polynom operator *(Polynom First, Polynom Second)
{
List <Polynom> summaryarray = new List <Polynom>();
for (int i = 0; i <= First.Degree; i++)
{
int FirstDegree = First.GetCoefDegree(i);
if (First[i] == 0)
{
continue;
}
summaryarray.Add(new Polynom(FirstDegree + Second.Degree));
for (int j = 0; j <= Second.Degree; j++)
{
int SecondDegree = Second.GetCoefDegree(j);
summaryarray[summaryarray.Count - 1][summaryarray[summaryarray.Count - 1].GetCoefIndex(FirstDegree + SecondDegree)] = First[i] * Second[j];
}
}
Polynom Result = new Polynom(summaryarray.Select(pol => pol.Degree).Max());
Result = summaryarray.Aggregate(Result, (Current, part) => Current + part);
return(Result);
}
/// <summary>
/// Возвращает результат умножения многочленов по модулю.
/// </summary>
/// <param name="First"></param>
/// <param name="Second"></param>
/// <returns></returns>
public static ModularPolynom operator *(ModularPolynom First, ModularPolynom Second)
{
First = GetNormalized(First);
Second = GetNormalized(Second);
if (First.Module != Second.Module)
{
throw new InvalidOperationException("Модули многочленов должны совпадать.");
}
if (First.Degree == 0)
{
return(Second * First[0]);
}
if (Second.Degree == 0)
{
return(First * Second[0]);
}
List <ModularPolynom> summaryarray = new List <ModularPolynom>();
for (int i = 0; i <= First.Degree; i++)
{
int FirstDegree = First.GetCoefDegree(i);
if (First[i] == 0)
{
continue;
}
summaryarray.Add(new ModularPolynom(FirstDegree + Second.Degree, First.Module));
for (int j = 0; j <= Second.Degree; j++)
{
int SecondDegree = Second.GetCoefDegree(j);
summaryarray[summaryarray.Count - 1][summaryarray[summaryarray.Count - 1].GetCoefIndex(FirstDegree + SecondDegree)] = First[i] * Second[j];
}
}
ModularPolynom Result = new ModularPolynom(summaryarray.Select(pol => pol.Degree).Max(), First.Module);
Result = summaryarray.Aggregate(Result, (Current, part) => Current + part);
return(Result);
}
