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Cod sursa(job #676588)
#include<fstream>
#include<vector>
#include<queue>
#define inf 500000001;
using namespace std;
vector <pair <int,int> > a[50001];
queue < int > q;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
int n,m,x,y,z,i,j,viz[50001],d[50001],nr[50001];
int main(){
f>>n>>m;
for (i=1;i<=m;i++){
f>>x>>y>>z;
a[x].push_back(make_pair(y,z));
}
d[1]=0;
for (i=2;i<=n;i++)
d[i]=inf;
q.push(1);
viz[1]=1;
while (!q.empty()){
int k=(int)q.front();
for(i=0;i<a[k].size();i++){
int v=(int)a[k][i].first;
int c=(int)a[k][i].second;
if (d[v]>d[k]+c){
d[v]=d[k]+c;
nr[v]++;
if(nr[v]>=n){
g<<"Ciclu negativ!";
return 0;
}
if(viz[v]==0){
q.push(v);
viz[v]=1;
}
}
}
q.pop();
viz[k]=0;
}
for (i=2;i<=n;i++)
g<<d[i]<<" ";
return 0;
}