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Cod sursa(job #906340)
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
#define Nmax 50001
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
vector<pair<int, int> > G[Nmax];
int N, M, D[Nmax], frecv[Nmax];
bool ok;
void bellmanford() {
vector<pair<int, int> >:: iterator it;
queue<int> Q;
int nod;
fill(D+1, D+N+1, 1<<30);
Q.push(1);
D[1] = 0;
frecv[1] = 1;
while(!Q.empty()) {
nod = Q.front();
Q.pop();
for(it = G[nod].begin(); it!=G[nod].end(); ++it)
if(D[it->first] > D[nod] + it->second) {
D[it->first] = D[nod] + it->second;
Q.push(it->first);
frecv[it->first]++;
/*if(frecv[it->first] >= N) {
g<<"Ciclu negativ!"<<"\n";
f.close(); g.close();
ok = false;
return;
}*/
}
}
}
int main() {
int i, x, y, z;
f>>N>>M;
while(M--) {
f>>x>>y>>z;
G[x].push_back(make_pair(y,z));
}
ok = true;
bellmanford();
//if(ok) {
for(i=2; i<=N; ++i)
g<<D[i]<<" ";
g<<"\n";
f.close();
g.close();
//}
return 0;
}