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Cod sursa(job #556326)
// infoarena: problema/bellmanford //
#include <fstream>
#include <vector>
#include <set>
using namespace std;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
const int MAXN = 50010;
const int MAXM = 250010;
vector<int> g[MAXN];
set<int> q;
int i,j,n,m,x,y,z,pred[MAXN],s[MAXM],e[MAXM],l[MAXM],d[MAXN];
int main()
{
in>>n>>m;
for(i=1; i<=m; i++)
{
in>>x>>y>>z;
g[x].push_back(i);
s[i] = x;
e[i] = y;
l[i] = z;
}
for(i=2; i<=n; i++)
d[i] = 1<<29;
for(i=1; i<=m; i++)
q.insert(i);
for(i=2; i<=n; i++)
for(set<int>::iterator it=q.begin(); it!=q.end(); it++)
if(l[*it] + d[s[*it]] < d[e[*it]])
{
d[e[*it]] = l[*it] + d[s[*it]];
pred[e[*it]] = s[*it];
}
else
{
q.erase(it);
}
for(i=1; i<=m; i++)
if(l[i] + d[s[i]] < d[e[i]])
{
out<<"Ciclu negativ!";
return 0;
}
for(i=2; i<=n; i++)
out<<d[i]<<' ';
return 0;
}