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Cod sursa(job #899532)
#include <fstream>
#include <vector>
#include <list>
#define INF (1<<30)-1
#define nmax 50001
using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
vector < pair <int, int> > v[nmax];
list <int> coada;
int n,d[nmax],k,use[nmax],cnt[nmax];
int main()
{
f>>n;
int i,j,m,x,y,c,nod;
f>>m;
for(i=0;i<m;i++)
{
f>>x>>y>>c;
v[x].push_back(make_pair(y,c));
}
for(i=2;i<=n;i++) d[i]=INF;
coada.push_back(1);
d[1]=0;
while(!coada.empty())
{
nod=coada.front();
cnt[nod]++;
for(i=0;i<v[nod].size();i++)
{
x=v[nod][i].first;
y=v[nod][i].second;
if(d[x]>d[nod]+y)
{
d[x]=d[nod]+y;
if(!use[x]) {coada.push_back(x); use[x]=1;}
}
}
coada.pop_front();
use[nod]=0;
if(cnt[nod]==n) {k=-1; break;}
}
if(k==-1) g<<"Ciclu negativ!";
else
{
for(i=2;i<=n;i++)
g<<d[i]<<' ';
}
}