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Cod sursa(job #956712)
#include<fstream>
#include<queue>
#include<vector>
using namespace std;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
bool s[50001];
struct graf{
int x,cost;
};
vector<graf>a[10000];
queue<int>q;
int n,m,d[250001],nrq[250001];
bool bf(int);
void afisare();
int main()
{
int i,p,y,cos;
in>>n>>m;
for(i=1;i<=m;i++)
{
in>>p>>y>>cos;
graf w;
w.x=y;
w.cost=cos;
a[p].push_back(w);
}
if(bf(1)==true)
afisare();
else
out<<"Ciclu negativ!";
return 0;
}
bool bf(int x0)
{
int i,y,p,x;
for(i=1;i<=n;i++)
d[i]=100000;
d[x0]=0;
q.push(x0);
s[x0]=true;
nrq[x0]=1;
while(!q.empty())
{
y=q.front();
q.pop();
s[y]=false;
for(i=0;i<a[y].size();i++)
{
if(d[y]+a[y][i].cost<d[a[y][i].x])
{
d[a[y][i].x]=a[y][i].cost+d[y];
if(s[a[y][i].x]==false)
{
q.push(a[y][i].x);
s[a[y][i].x]=true;
nrq[a[y][i].x]++;
}
}
if(nrq[a[y][i].x]==n)
return false;
}
}
return true;
}
void afisare(){
for(int i=2;i<=n;i++)
{
out<<d[i]<<" ";
}
}