Pagini recente » Cod sursa (job #1008672) | Cod sursa (job #1248223) | Cod sursa (job #2621250) | Cod sursa (job #725482) | Cod sursa (job #3269766)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
int n,m;
const int inf=100000000;
typedef pair<int,int> pint;
vector<vector<pint>>G(50005);
vector <int> d(50005,inf);
bool inq[50005];
int l[50005];
void spfa(int start)
{
queue <int>q;
bool CN=0;
d[start]=0;
q.push(start);
inq[start]=1;
while(!q.empty()&&!CN)
{
int v=q.front();
inq[v]=0;
q.pop();
for(int i=0;i<G[v].size()&&!CN;i++)
{
int u=G[v][i].second;
if(!inq[u])
{
int w=G[v][i].first;
if(d[u]>d[v]+w)
{
l[u]=l[v]+1;
if(l[u]==n)
CN=1;
d[u]=d[v]+w;
q.push(u);
inq[u]=1;
}
}
}
}
if(!CN)
for(int i=2;i<=n;i++)
g<<d[i]<<" ";
else
g<<"Ciclu negativ!";
}
int main()
{
f>>n>>m;
for(int i=1;i<=m;i++)
{
int x,y,c;
f>>x>>y>>c;
G[x].push_back(make_pair(c,y));
}
spfa(1);
return 0;
}