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Cod sursa(job #559986)
using namespace std;
#include<iostream>
#include<fstream>
#include<vector>
#include<queue>
#define pb push_back
#define nmax 50010
#define oo 0x3f3f3f3f
struct nod{
int lg,c;
};
vector<nod> G[nmax];
int isinq[nmax],dp[nmax],nr[nmax],N,M;
ofstream fout("bellmanford.out");
queue<int> q;
int ok;
void solve()
{ int i;
for(i=0;i<=N;i++)
{
dp[i]=oo;
nr[i]=0;
}
dp[1]=0;
q.push(1);
isinq[1]=1;
nr[1]=1;
ok=1;
int u;
vector<nod>::iterator it;
while(!q.empty() && ok)
{
u=q.front();
q.pop();
isinq[u]=0;
for(it=G[u].begin();it<G[u].end();it++)
{
if(dp[it->lg]>dp[u]+it->c)
{
dp[it->lg]=dp[u]+it->c;
if(!isinq[it->lg])
{
q.push(it->lg);
isinq[it->lg]=1;
nr[it->lg]++;
if(nr[it->lg]>N)
{
ok=0;
}
}
}
}
}
if(ok==0)
{
fout<<"Ciclu negativ!\n";
}
else{
for(i=2;i<=N;i++)
{
fout<<dp[i]<<" ";
}
fout<<"\n";
}
}
void cit()
{
ifstream fin("bellmanford.in");
int i,x,y,c;
fin>>N>>M;
for(i=1;i<=M;i++)
{
fin>>x>>y>>c;
G[x].pb((nod){y,c});
}
fin.close();
}
int main()
{
cit();
solve();
fout.close();
return 0;
}