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Cod sursa(job #559416)
#include <stdio.h>
#include <algorithm>
#define INF 10000000
#define Nmax 50500
using namespace std;
int best[Nmax],coada[Nmax*10],nrviz[Nmax],viz[Nmax],dr=1,st,S=1,ai_ciclu_soro;
int n,m,x,y,z;
struct nod{
int start,sf,cost;
nod *next;
};
nod *L[Nmax];
void add( int x, int y, int z)
{
nod *q=new nod;
q->start=x;
q->sf=y;
q->cost=z;
q->next=L[x];
L[x]=q;
}
void BellmanFord(int k)
{
viz[k]=1;
for(nod *p=L[k]; p!=NULL; p=p->next)
{
if(best[p->sf]>best[k]+p->cost)
{
best[p->sf]=best[k]+p->cost;
if(viz[p->sf]==0)
{
viz[p->sf]=1;
coada[dr++]=p->sf;
nrviz[p->sf]++;
if(nrviz[p->sf]==n+1)
{
ai_ciclu_soro=1;
return;
}
}
}
}
}
int main()
{
freopen("bellmanford.in","r",stdin);
freopen("bellmanford.out","w",stdout);
scanf("%d%d",&n,&m);
for(int i=1;i<=m;++i)
{
scanf("%d%d%d\n",&x,&y,&z);
add(x,y,z);
}
for(int i=1; i<=n; ++i)
best[i]=INF;
coada[st]=S;
nrviz[S]=1;
viz[S]=1;
best[S]=0;
while(st<dr && !ai_ciclu_soro)
{
BellmanFord(coada[st]);
if(ai_ciclu_soro==1)
{
printf("Ciclu negativ!");
return 0;
}
st++;
}
for(int i=2;i<=n;++i)
printf("%d ",best[i]);
return 0;
}