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Cod sursa(job #569162)
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
const int N = 50005;
const int INF = 1000000000;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
struct pereche
{
int nod,cost;
};
vector<pereche> a[N];
queue<int> q;
bool inq[N];
int nrq[N],d[N],n,m;
void citire()
{
int x,y,c;
in>>n>>m;
while(m--)
{
in>>x>>y>>c;
a[x].push_back((pereche){y,c});
}
}
void init()
{
for(int i=1 ; i<=n ; i++)
d[i] = INF;
}
void scrie()
{
for(int i=2 ; i<=n ; i++)
out<<d[i]<<" ";
out<<"\n";
}
void bf()
{
int x,y,c;
init();
d[1] = 0;
q.push(1);
inq[1] = true;
nrq[1]++;
while(!q.empty())
{
x = q.front();
q.pop();
inq[x] = false;
for(size_t i=0 ; i<a[x].size() ; i++)
{
y = a[x][i].nod;
c = a[x][i].cost;
if(d[x] + c < d[y])
{
d[y] = d[x] + c;
if(!inq[y])
{
q.push(y);
inq[y] = true;
nrq[y]++;
if(nrq[y] == n)
{
out<<"Ciclu negativ!\n";
return;
}
}
}
}
}
scrie();
}
int main()
{
citire();
bf();
return 0;
}