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Cod sursa(job #933835)
#include <cstdio>
#include <cstdlib>
#include <queue>
#include <vector>
#include <algorithm>
using namespace std;
#define PI pair<int, int>
#define f first
#define s second
#define mp make_pair
#define pb push_back
#define Nmax 50010
#define forit(it, v) for(typeof((v).begin()) it = (v).begin(); it != (v).end(); ++ it)
#define Inf 0x3f3f3f3f
int N, M, X, Y, C, Dist[Nmax], Ap[Nmax];
bool InQueue[Nmax];
vector<PI> G[Nmax];
void BellmanFord()
{
for(int i = 1; i <= N; ++ i) Dist[i] = Inf;
Dist[1] = 0;
queue<int> Q;
Q.push(1);
Ap[1] = 1;
InQueue[1] = 1;
while(!Q.empty())
{
int Node = Q.front();
Q.pop();
InQueue[Node] = 0;
if(Ap[Node] > N)
{
printf("Ciclu negativ!");
exit(0);
}
forit(it, G[Node])
if(Dist[it -> f] > Dist[Node] + it -> s)
{
Dist[it -> f] = Dist[Node] + it -> s;
if(!InQueue[it -> f])
{
InQueue[it -> f] = 1;
Ap[it -> f] ++;
Q.push(it -> f);
}
}
}
for(int i = 2; i <= N; ++ i) printf("%i ", Dist[i]);
}
int main()
{
freopen("bellmanford.in", "r", stdin);
freopen("bellmanford.out", "w", stdout);
int i;
scanf("%i %i", &N, &M);
for(i = 1; i <= M; ++ i)
{
scanf("%i %i %i", &X, &Y, &C);
G[X].pb(mp(Y, C));
}
BellmanFord();
return 0;
}