Pagini recente » Cod sursa (job #2858218) | Cod sursa (job #2141315) | Cod sursa (job #1040775) | Cod sursa (job #1837821) | Cod sursa (job #2368839)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
const int N=50005;
const int oo=100000000;
vector<pair <int,int> > a[N];
queue <int> Q;
int n,m,d[N];
bool viz[N];
int nr[N];
void citire()
{
int i,x,y,z;
in>>n>>m;
for(i=1; i<=m; i++)
{
in>>x>>y>>z;
a[x].push_back(make_pair(y,z));
}
}
int BellmanFord()
{
int ok=1,vecin,cost,i;
for(i=2; i<=n; i++)
d[i]=oo;
Q.push(1);
viz[1]=1;
nr[1]=1;
while(!Q.empty() && ok==1)
{
int nod=Q.front();
viz[nod]=0;
Q.pop();
for(i=0; i<a[nod].size(); i++)
{
cost=a[nod][i].second;
vecin=a[nod][i].first;
if(d[vecin]>d[nod]+cost)
{
d[vecin]=d[nod]+cost;
if(viz[vecin]==0)
{
Q.push(vecin);
viz[vecin]=1;
nr[vecin]++;
if(nr[vecin]>n)
return -1;
}
}
}
}
return ok;
}
void afisare()
{
for(int i=2; i<=n; i++)
out<<d[i]<<" ";
}
int main()
{
citire();
if(BellmanFord()==-1)
out<<"Ciclu negativ!";
else
afisare();
return 0;
}