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Cod sursa(job #554556)
#include<fstream>
#include<vector>
#include<queue>
#define mn INT_MIN
#define asd 50002
using namespace std;
vector<long long> v[asd],c[asd];
queue<long long> q;
long long d[asd];
bool viz[asd];
long long m,n;
void citire()
{
long long i,x,y,e;
ifstream in("bellmanford.in");
in>>n>>m;
for (i=1;i<=m;i++)
{
in>>x>>y>>e;
v[x].push_back(y);
c[x].push_back(e);
}
//for (i=1;i<=n;i++)
// d[i]=mn;
}
void af()
{
ofstream out("bellmanford.out");
out<<"Ciclu negativ!";
out.close();
}
void afisare()
{
long long i;
ofstream out("bellmanford.out");
for (i=2;i<=n;i++)
out<<d[i]<<" ";
out<<'\n';
}
int main()
{
long long i,x,y,ok=1;
citire();
q.push(1);
d[1]=0;
viz[1]=1;
while (!q.empty()&&ok)
{
x=q.front();
q.pop();
for (i=0;i<(long long)v[x].size();i++)
{
y=v[x][i];
if (!viz[y])
{
//if (d[y]>d[x]+c[x][i])
{
d[y]=d[x]+c[x][i];
q.push(y);
viz[y]=1;
}
}
else if (d[x]+c[x][i]<d[y])
{
d[y]=d[x]+c[x][i];
q.push(y);
//if (d[y]<0)
//ok=0;
}
if ((int)q.size()>n)
ok=0;
}
}
if (ok)
afisare();
else
af();
}