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Cod sursa(job #750080)
#include <fstream>
#include <vector>
#include <queue>
#include <bitset>
#define INF 1000000000
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
vector< pair<int,int> > v[50001];
queue<int> q;
bitset<50001> used;
int c[50001];
int main()
{
int n,m,x,y,dc;
fin>>n>>m;
for(int i=1;i<=m;i++)
{
fin>>x>>y>>dc;
v[x].push_back(make_pair(y,dc));
}
for(int i=1;i<=n;i++)
c[i]=INF;
int curent = 1;
c[1]=0;
q.push(1);
used[1]=1;
while(!q.empty())
{
curent = q.front();
used[curent]=1;
for(int j=0;j<v[curent].size();j++)
{
if(c[curent]!=INF)
if(v[curent][j].second + c[curent] < c[v[curent][j].first])
{
c[v[curent][j].first]=v[curent][j].second + c[curent];
if(!used[v[curent][j].first])
{
//used[curent]=1;
q.push(v[curent][j].first);
}
}
}
q.pop();
}
for(int i=1;i<=n;i++)
for(int j=0;j<v[i].size();j++)
if(c[v[i][j].first]!=INF && c[v[i][j].first] > c[i]+v[i][j].second)
{
fout<<"Ciclu negativ!\n";
return 0;
}
for(int i=2;i<=n;i++)
if(c[i]==INF)
fout<<0<<' ';
else fout<<c[i]<<' ';
fout<<'\n';
fin.close();
fout.close();
return 0;
}