Pagini recente » Cod sursa (job #3283589) | Cod sursa (job #2329560) | Cod sursa (job #2851584) | Cod sursa (job #1339643) | Cod sursa (job #2856735)
#include <fstream>
#include <vector>
#define INF 1e9
#include <queue>
using namespace std;
ifstream cin ("bellmanford.in");
ofstream cout ("bellmanford.out");
struct varf
{
int x, c;
};
int n, m, x0=1, rez;
vector <varf> G[102]; ///liste de adiacenta cu costuri
bool uz[50002];
int cmin[50002];
int pre[50002];
int nr[50002]; //nr de drumuri de cost minim de la x0 la i
queue <int> C;
void citire();
bool bf();
void afis();
int main()
{
citire();
rez=bf();
afis();
return 0;
}
void citire()
{
int i, j, c;
varf aux;
cin>>n>>m;
while (cin>>i>>j>>c)
{
//in lista de adiacenta a lui i trebuie sa adaug perechea j,k
aux.x=j;
aux.c=c;
G[i].push_back(aux);
}
for (i=1; i<=n; i++)
cmin[i]=INF;
cmin[x0]=0;
}
bool bf()
{
///returneaza 0 daca exista circuite de cost negativ si 1 altfel
///initializez coada cu vf de start
int i, vf, cost, x;
C.push(x0);
nr[x0]=1;
while (!C.empty())
{
x=C.front();
C.pop();
///parcurg lista de adiacenta a lui x
for (i=0; i<G[x].size(); i++)
{
vf=G[x][i].x;
cost=G[x][i].c;
if (cmin[vf]>cmin[x]+cost)
{
cmin[vf]=cmin[x]+cost;
C.push(vf);
nr[vf]++;
if (nr[vf]==n)
return 0;
}
}
}
return 1;
}
void afis()
{
int i, j, cnt;
if (rez==0)
cout<<"Ciclu negativ!";
else
for (i=2; i<=n; i++)
cout<<cmin[i]<<' ';
cout<<'\n';
}