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Cod sursa(job #949599)
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
#define in "bellmanford.in"
#define out "bellmanford.out"
#define N 50005
#define y first
#define c second
#define oo 1 << 30
typedef pair <int, int> nod;
typedef unsigned u;
vector <nod> graf[N];
vector <int> nr (N, 0);
vector <int> d (N, oo);
queue <int> Q;
int n, m;
int NEG () {
ofstream fout (out);
fout << "Ciclu negativ!";
fout.close();
return 0;
}
int main () {
ifstream fin (in);
fin >> n >> m;
for (int i = 0; i < m; ++i) {
int x, y, c;
fin >> x >> y >> c;
graf[x].push_back (nod (y, c));
}
fin.close();
Q.push (1);
d[1] = 0;
while (Q.size()) {
int x = Q.front();
Q.pop();
for (u i = 0; i < graf[x].size(); ++i)
if (d[x] + graf[x][i].c < d[graf[x][i].y]) {
d[graf[x][i].y] = d[x] + graf[x][i].c;
nr[graf[x][i].y] ++;
if (nr[graf[x][i].y] > n) {
return NEG ();
}
Q.push (graf[x][i].y);
}
}
ofstream fout (out);
for (int i = 2; i <= n; ++i)
fout << d[i] << " ";
fout.close();
return 0;
}