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Cod sursa(job #886012)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
const int N=50001;
struct cost
{
int vf,c;
};
vector <cost> a[N];
queue <int> q;
int n,m,d[N],nrq[N];
bool inq[N];
void citire()
{
int x,y,c;
cost aux;
in>>n>>m;
for(int i=1;i<=m;i++)
{
in>>x>>y>>c;
aux.vf = y;
aux.c=c;
a[x].push_back(aux);
}
}
bool bfs(int x)
{
int y;
q.push(x);
while(!q.empty())
{
x=q.front();
q.pop();
inq[x]=false;
for(size_t i=0;i<a[x].size();i++)
{
y=a[x][i].vf;
if(d[y]>d[x]+a[x][i].c)
{
d[y]=d[x]+a[x][i].c;
if(!inq[y])
{
q.push(y);
inq[y]=true;
nrq[y]++;
}
}
}
if(nrq[x]==n)
return false;
}
return true;
}
int main()
{
for(int i=0;i<=N;i++)
d[i]=10000;
citire();
d[1]=0;
if(bfs(1))
for(int i=2;i<=n;i++)
out<<d[i]<<' ';
else
out<<"Ciclu negativ!";
return 0;
}