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Cod sursa(job #931990)
#include <cstdio>
#include <vector>
#include <queue>
#define NMAX 50001
#define INF 999999999
using namespace std;
struct nod
{
int v;
int cost;
};
struct comp
{
/// gen dijkstra
bool operator () (const int &a, const int &b) const
{
return cost[a] > cost[b];
}
};
int n, nr[NMAX], cost[NMAX];
vector <nod> G[NMAX];
priority_queue <int, vector <int>, comp> Q;
void citire()
{
freopen("bellmanford.in", "r", stdin);
freopen("bellmanford.out", "w", stdout);
int m, x;
nod y;
scanf ("%d %d", &n, &m);
for(int i = 0; i < m; i++)
{
scanf ("%d %d %d", &x, &y.v, &y.cost);
G[x].push_back(y);
}
}
bool bellmanford()
{
for (int i = 2; i <= n; cost[i] = INF, ++ i);
Q.push(1);
while (!Q.empty())
{
int v = Q.top();
Q.pop();
for (unsigned int i = 0; i < G[v].size(); ++ i)
{
nod aux = G[v][i];
if (cost[v] + aux.cost < cost[aux.v])
{
cost[aux.v] = cost[v] + aux.cost;
Q.push(aux.v);
++ nr[v];
}
}
if (nr[v] > n)
return 0;
}
return 1;
}
void afisare()
{
for (int i = 2; i <= n; ++ i)
if (cost[i] == INF)
printf("0 ");
else
fprintf("%d ", cost[i]);
printf("\n");
}
int main()
{
citire();
if (!bellmanford())
fprintf (outFile, "Ciclu negativ!");
else
afisare();
return 0;
}