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Cod sursa(job #951710)
#include<fstream>
#include<queue>
#include<vector>
#define pb push_back
#define mp make_pair
#define fiu first
#define cost second
#define INF 1<<30
using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
int i,n,m,x,y,z,d[50100],nr[50100];
vector<pair<int,int> >l[50100];
queue<int>q;
int main()
{
f>>n>>m;
for(i=1;i<=m;++i)
{
f>>x>>y>>z;
l[x].pb(mp(y,z));
}
for(i=2;i<=n;++i)
d[i]=INF;
q.push(1);
while(!q.empty())
{
x=q.front();
q.pop();
++nr[x];
if(nr[x]>n)
{
g<<"Ciclu negativ!\n";
return 0;
}
for(vector<pair<int,int> >::iterator it=l[x].begin();it!=l[x].end();++it)
if(d[x]+it->cost<d[it->fiu])
{
d[it->fiu]=d[x]+it->cost;
q.push(it->fiu);
}
}
for(i=2;i<=n;++i)
g<<d[i]<<' ';
}