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Cod sursa(job #699083)
#include <stdio.h>
#include <vector>
#include <queue>
#include <algorithm>
#define pb push_back
#define mp make_pair
#define Nmax 50001
#define INF 10000000
using namespace std;
vector< pair <int, int> > G[Nmax];
queue <int> q;
int n, m, i, d[Nmax], ap[Nmax];
void Bellman_Ford()
{
int x, mih;
d[1] = 0;
q.push(1);
ap[1]=1;
for (i=2;i<=n+2;i++)
d[i] = INF;
while (!q.empty())
{
x = q.front();
q.pop();
mih = G[x].size();
for (i=0; i<mih;i++)
if (d[x]+G[x][i].second < d[G[x][i].first])
{
d[G[x][i].first] = d[x] + G[x][i].second;
q.push(G[x][i].first);
ap[G[x][i].first]++;
if (ap[G[x][i].first]>n)
{
printf("Ciclu negativ!\n");
return ;
}
}
}
for (i=2;i<=n;i++)
printf("%d ",d[i]);
printf("\n");
}
int main()
{
int a, b, c;
freopen("bellmanford.in","r",stdin);
freopen("bellmanford.out","w",stdout);
scanf("%d %d", &n, &m);
for (i=1;i<=m;i++)
{
scanf("%d %d %d", &a, &b, &c);
G[a].pb(mp(b,c));
}
Bellman_Ford();
}