Pagini recente » Cod sursa (job #591120) | Cod sursa (job #512517) | Cod sursa (job #1884070) | Cod sursa (job #1627050) | Cod sursa (job #3216348)
#include <bits/stdc++.h>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
#define ll long long
const int N=50001;
const int M=250001;
const int INF=1e9;
vector<pair<int,int> > v[N];
priority_queue<pair<int,int> > pq;
struct ura{
int x,y,c;
} vm[M];
int vcost[N];
bool vc[N];
int main()
{
int n,m,i,x,y,c,nod,j,nod2;
ll pas=0;
fin>>n>>m;
for(i=1;i<=m;i++)
{
fin>>x>>y>>c;
v[x].push_back({y,c});
vm[i]={x,y,c};
}
for(i=1;i<=n;i++)
vcost[i]=INF;
vcost[1]=0;
pq.push({0,1});
while(!pq.empty())
{
pas++;
nod=pq.top().second;
pq.pop();
vc[nod]=0;
for(j=0;j<v[nod].size();j++)
{
nod2=v[nod][j].first;
c=v[nod][j].second;
if(vcost[nod]+c<vcost[nod2])
{
vcost[nod2]=vcost[nod]+c;
if(!vc[nod2]){
pq.push({-vcost[nod2],nod2});
vc[nod2]=1;
}
}
}
}
for(i=1;i<=m;i++)
{
if(vcost[vm[i].x]+vm[i].c<vcost[vm[i].y])
{
fout<<"Ciclu negativ!";
return 0;
}
}
for(i=2;i<=n;i++)
fout<<vcost[i]<<" ";
return 0;
}