Cod sursa(job #907007)
#include <fstream>
#include <queue>
using namespace std;
struct nod
{
int val, cost;
};
vector <nod> grf[50001];
queue <int> coada;
int d[50001];
bool ok;
int ccost[50001];
bool incoada[50001];
int main()
{
int n, m, i, a, b, c;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
f>>n>>m;
for(i=1; i<=m; i++)
{
f>>a>>b>>c;
nod act;
act.val=b;
act.cost=c;
grf[a].push_back(act);
}
for(i=1; i<=n; i++)
{
d[i]=10000000;
}
coada.push(1);
d[1]=0;
incoada[1]=1;
while(!coada.empty() && !ok)
{
int cx=coada.front();
coada.pop();
incoada[cx]=0;
for(i=0; i<grf[cx].size(); i++)
{
if(d[cx]+grf[cx][i].cost<d[grf[cx][i].val])
{
d[grf[cx][i].val]=d[cx]+grf[cx][i].cost;
if(!incoada[grf[cx][i].val])
{
if(ccost[grf[cx][i].val]>n)
ok=true;
else
{
coada.push(grf[cx][i].val);
ccost[grf[cx][i].val]++;
incoada[grf[cx][i].val]=1;
}
}
}
}
}
if(ok)
{
g<<"Ciclu negativ!";
}
else
{
for(i=2; i<=n; i++)
{
if(d[i]!=10000000)
g<<d[i]<<" ";
else
g<<0<<" ";
}
}
}