Pagini recente » Cod sursa (job #3366434) | Cod sursa (job #3366449) | Cod sursa (job #3366450) | Cod sursa (job #3366432) | Cod sursa (job #3367029)
#include <bits/stdc++.h>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
const int NMAX=50005;
const long long INF=4e18;
int n,m;
vector<pair<int,int>> v[NMAX];
long long d[NMAX];
int cnt[NMAX];
bool inq[NMAX];
bool negativ;
void citire()
{
fin>>n>>m;
for(int i=1; i<=m; i++)
{
int x,y,c;
fin>>x>>y>>c;
v[x].push_back({y,c});
}
}
void bellmanford()
{
for(int i=1; i<=n; i++)
d[i]=INF;
queue<int> q;
d[1]=0;
q.push(1);
inq[1]=1;
while(!q.empty())
{
int nod=q.front();
q.pop();
inq[nod]=0;
for(auto x:v[nod])
{
int vec=x.first;
int cost=x.second;
if(d[vec]>d[nod]+cost)
{
d[vec]=d[nod]+cost;
cnt[vec]++;
if(cnt[vec]>=n)
{
negativ=true;
return;
}
if(!inq[vec])
{
q.push(vec);
inq[vec]=1;
}
}
}
}
}
void afisare()
{
if(negativ)
{
fout<<"Ciclu negativ!";
return;
}
for(int i=2; i<=n; i++)
fout<<d[i]<<" ";
}
int main()
{
citire();
bellmanford();
afisare();
return 0;
}