floyd alfa 2, C++ (gcc)

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#include <bits/stdc++.h>

using namespace std;

const int inf = numeric_limits<int>::max();

class Matrix 
{
	public:
		void matrixSize(int a, int b);
		int getColumn();
		int getRow();
		void showMatrix();
		void fillMatrix();
		vector<vector<double>> matrix;
		vector<vector<char>> matrixA;
	private:
		int column;
		int row;
};

void Matrix::matrixSize(int b, int a)
{
	column=a;
	row=b;
	matrix.resize(row);
    matrixA.resize(row);
	for(int i = 0; i < matrix.size(); i++)
	{
		matrix[i].resize(column);
		matrixA[i].resize(column);
	}
}

int Matrix::getColumn()
{
	return column;
}

int Matrix::getRow()
{
	return row;
}

void Matrix::showMatrix()
{
    int tam;
    tam = row;
    cout << "Matriz de longitudes: \n\n";
	for(int i = 0; i < tam; i++)
	{
		for(int j = 0; j < tam; j++)
		{
            if(matrix[i][j] == inf)
                cout << "inf ";
            else
                cout << matrix[i][j] << " ";
		} cout << "\n";
	}
    
    cout << "\nMatriz de nodos antecesores: \n\n";
    
	for(int i = 0; i < tam; i++)
	{
		for(int j = 0; j < tam; j++)
		{
			cout << matrixA[i][j] << " ";
		} cout << "\n";
	}
    
}

void Matrix::fillMatrix()
{
	double in;
	for(int i = 0; i < row; i++)
	{
		for(int j = 0; j < column; j++)
		{
			cin >> in;
			matrix[i][j] = in;
		}
	}
}

Matrix multMatrix(Matrix ma, Matrix mb)
{
	Matrix mr;
	double suma;
	int ra = ma.getRow();
	int ca = ma.getColumn();
	int rb = mb.getRow();
	int cb = mb.getColumn();
    
	mr.matrixSize(ra, cb);

for(int a = 0; a < ra; a++)
	{
		for(int b = 0; b < cb; b++)
		{	
			suma = 0;
			for(int i = 0; i < ca; i++)
			{
				suma += ma.matrix[a][i]*mb.matrix[i][b];
			}
			mr.matrix[a][b] = suma;
		}
	}
    return mr;
}

Matrix potMatrix(Matrix a, int pot)
{
    Matrix matrixG;
    matrixG = a;
    
    for(int i = 0; i < pot-1; i++)
    {
        matrixG = multMatrix(matrixG, a);
    }
    
    return matrixG;
}

Matrix inicializarMatrices(Matrix matriz)
{
    int a,b;
    a = matriz.getColumn();
    b = matriz.getRow();
    
    for (int i = 0; i < a ; i++)
    {
        for(int j = 0; j < b; j++)
        {
            matriz.matrixA[i][j] = char('A' + i);
            
            if(matriz.matrix[i][j] == -1)
                matriz.matrix[i][j] = inf;
        }
    }
    return matriz;
}

void realizarIteracion(Matrix a, int i, int j)
{
    
}

int main()
{
    int tam;
    Matrix matrices;
    
    cin >> tam;
    
    matrices.matrixSize(tam, tam);
    matrices.fillMatrix();
    matrices = inicializarMatrices(matrices);    
    
    matrices.showMatrix();
    
    
}

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Compilation time: 1.93 sec, absolute running time: 0.07 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 2 sec