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Cod sursa(job #474298)
#include <cstdio>
#include <vector>
#include <queue>
using namespace std;
#define NMAX 50010
#define INF 1 << 30
int cst[NMAX], viz[NMAX], viz_cnt[NMAX], n, m, i;
vector < pair <int, int> > G[NMAX];
queue <int> Q;
void citire();
int bellman_ford();
int main() {
freopen("bellmanford.in", "r", stdin);
freopen("bellmanford.out", "w", stdout);
citire();
if (!bellman_ford())
printf("Ciclu negativ!");
else
for (i = 2; i <= n; i++)
printf("%d ", cst[i]);
return 0;
}
int bellman_ford() {
int node, son, cost, i;
for (i = 2; i <= n; i++)
cst[i] = INF;
Q.push(1), viz[1] = 1, cst[1] = 0;
while (!Q.empty()) {
node = Q.front();
for (i = 0; i < G[node].size(); i++) {
son = G[node][i].first, cost = G[node][i].second;
if (cst[node] + cost < cst[son]) {
cst[son] = cst[node] + cost;
if (!viz[son]) {
Q.push(son), viz[son] = 1, viz_cnt[son]++;
if (viz_cnt[son] > n)
return 0;
}
}
}
Q.pop(), viz[node] = 0;
}
return 1;
}
void citire() {
int x, y, c;
scanf("%d %d", &n, &m);
for (i = 1; i <= m; i++) {
scanf("%d %d %d", &x, &y, &c);
G[x].push_back( make_pair(y, c) );
}
}