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Cod sursa(job #700459)
#include <cstdio>
#include <vector>
#include <queue>
#include <algorithm>
#include <iostream>
using namespace std;
#define maxN 50005
#define INF 0x3f3f3f3f
#define PB push_back
#define MKP make_pair
int N , M , cost[maxN] , node_count[maxN];
bool inQ[maxN];
vector <pair <int , int> > lista[maxN];
queue <int> Q;
int main ()
{
freopen ("bellmanford.in" , "r" , stdin);
freopen ("bellmanford.out" , "w" , stdout);
scanf ("%d %d" , &N , &M);
int a , b , c;
for (int i = 1 ; i <= M ; ++i)
{
scanf ("%d %d %d" , &a , &b , &c);
lista[a].PB (MKP (b , c));
}
for (int i = 2 ; i <= N ; ++i)
cost[i] = INF;
Q.push (1);
inQ[1] = true;
node_count[1] = 1;
while (!Q.empty ())
{
int nod = Q.front ();
Q.pop ();
inQ[nod] = false;
for (unsigned int i = 0 ; i < lista[nod].size () ; ++i)
{
int nodcur = lista[nod][i].first;
int costcur = lista[nod][i].second;
if (cost[nodcur] <= cost[nod] + costcur) continue;
cost[nodcur] = cost[nod] + costcur;
++node_count[nodcur];
if (node_count[nodcur] > N)
{
printf ("Ciclu negativ!");
return 0;
}
if (!inQ[nodcur])
{
Q.push (nodcur);
inQ[nodcur] = true;
}
}
}
for (int i = 2 ; i <= N ; ++i)
if (cost[i] == INF)
printf ("0 ");
else printf ("%d " , cost[i]);
return 0;
}