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Cod sursa(job #676615)
#include <fstream>
#include <vector>
#include <queue>
#define inf 500000001;
using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
vector < pair<int, int> > a[50001];
queue <int> q;
int n,m,i,j,x,y,z,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;
}