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Cod sursa(job #534404)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
#define nmax 50001
long n, m;
vector < pair<long, long> > v[nmax];
queue <long> Q;
long d[nmax], viz[nmax];
inline void citire()
{
long x, y, c;
ifstream in("bellmanford.in"); in>>n>>m;
for(long i=1; i<=m; i++)
{
in>>x>>y>>c;
v[x].push_back( make_pair(y, c) );
}
}
inline void afisare(bool ciclu)
{
ofstream out("bellmanford.out");
if(ciclu)
out<<"Ciclu negativ!";
else
for(long i=2; i<=n; i++)
out<<d[i]<<" ";
}
int bellman_ford()
{
long nod;
vector< pair<long, long> >::pointer next;
Q.push(1);
while(!Q.empty())
{
nod = Q.front(); Q.pop();
for(long i=0; i<v[nod].size(); i++)
{
next = &v[nod][i];
if(d[nod]+next->second < d[next->first] || d[next->first]==0 )
{
d[next->first] = d[nod] + next->second;
viz[next->first]++;
if(viz[next->first] > n)
return 0;
Q.push(next->first);
}
}
}
return 1;
}
int main()
{
citire();
if( bellman_ford() )
afisare(0);
else
afisare(1);
return 0;
}