Pagini recente » Cod sursa (job #2949750) | Cod sursa (job #523397) | Cod sursa (job #216882) | Cod sursa (job #2472482) | Cod sursa (job #2139996)
/* Algoritmul lui Warshall - determina Inchiderea Tranzitiva
* Intrare: matricea de adiacenta
* Iesire: matricea lanturilor/drumurilor
*/
#include <fstream>
using namespace std;
ifstream fin("royfloyd.in");
ofstream fout("royfloyd.out");
const int MaxN = 101;
bool a[MaxN][MaxN]; // matrice de adiacenta. Algoritmul o transforma in matricea lanturilor
int n;
void ReadGraph();
void Warshall();
void Write();
int main()
{
ReadGraph();
Write();
Warshall();
Write();
}
void Warshall() // O(n^3)
{
for (int k = 1; k <= n; ++k)
for (int i = 1; i <= n; ++i)
for (int j = 1; j <= n; ++j)
if (i != j && a[i][j] == false)
a[i][j] = a[i][k] && a[k][j];
}
void ReadGraph()
{
fin >> n;
int x, y;
while (fin >> x >> y)
a[x][y] = a[y][x] = true;
}
void Write()
{
for (int i = 1; i <= n; i++, fout << '\n')
for (int j = 1; j <= n; ++j)
fout << a[i][j] << ' ';
fout << "\n\n";
}