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Cod sursa(job #879733)
#include <cstdio>
#include <bitset>
#include <queue>
#include <vector>
using namespace std;
#define MAXN 50010
#define INF 1 << 30
#define mp make_pair
int nodes, m;
bool negative_cycle = false;
vector< pair<int, int> > G[MAXN];
vector<int> dist(MAXN, INF);
void read()
{
scanf("%d %d", &nodes, &m);
for (int i = 0; i < m; ++i) {
int x, y, cost;
scanf("%d %d %d", &x, &y, &cost);
G[x].push_back(mp(y, cost));
}
}
void bellmanford()
{
queue<int> q;
bitset<MAXN> in_queue(false);
vector<int> in_cnt(MAXN, 0);
dist[1] = 0, q.push(1), in_queue[1].flip();
while (!q.empty() && !negative_cycle) {
int x = q.front();
q.pop();
vector< pair<int, int> >:: iterator it;
for (it = G[x].begin(); it != G[x].end(); ++it) {
if (dist[it->first] > dist[x] + it->second) {
dist[it->first] = dist[x] + it->second;
if (!in_queue[it->first]) {
if (in_cnt[it->first] > nodes)
negative_cycle = true;
else {
q.push(it->first);
in_queue[it->first] = true;
in_cnt[it->first]++;
}
}
}
}
}
}
void print()
{
for (int i = 2; i <= nodes; ++i)
printf("%d ", dist[i]);
printf("\n");
}
int main()
{
read();
bellmanford();
print();
return 0;
}