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Cod sursa(job #884791)
#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
using namespace std;
int n,m,q[50000],d[50000];
struct Nod
{
int x,cost;
};
vector <Nod> L[50000];
void Citire()
{
Nod aux;
int y,i;
ifstream fin("bellmanford.in");
fin>>n>>m;
for(i=1;i<=m;i++)
{
fin>>y>>aux.x>>aux.cost;
L[y].push_back(aux);
}
fin.close();
}
int BellmanFord(int S)
{
int ul,pr,k,i,N;
Nod aux;
pr = ul = 0;
q[ul] = S;
while(pr<=ul)
{
k = q[pr++];
N = L[k].size();
for(i=0;i<N;i++)
{
aux = L[k][i];
if(d[aux.x]>d[k]+aux.cost)
{
d[aux.x]=d[k]+aux.cost;
q[++ul]=aux.x;
if(d[aux.x]>d[k]+aux.cost) return 0;
}
}
}
return 1;
}
void Initializare(int S)
{
int infinit=2000000000;
for(int i=1;i<=n;i++)
d[i]=infinit;
d[S]=0;
}
int main()
{
Citire();
Initializare(1);
ofstream fout("bellmanford.out");
if(!BellmanFord(1))
{
fout<<"Ciclu negativ!";
fout.close();
return 0;
}
for(int i=2;i<=n;i++) fout<<d[i]<<" ";
fout.close();
return 0;
}