Mai intai trebuie sa te autentifici.
Cod sursa(job #2791281)
Utilizator | Data | 30 octombrie 2021 12:24:03 | |
---|---|---|---|
Problema | Algoritmul Bellman-Ford | Scor | 100 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 1.15 kb |
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
int n,m,x,y,u[50010],d[50010],cost;
vector<vector<pair<int,int>>>a;
queue<int>c;
bool v[50010];
int main()
{
in>>n>>m;
a.resize(n+5);
for(int i=1;i<=n;++i)
d[i]=1000000000;
d[1]=0;
for(int i=1;i<=m;++i)
{
in>>x>>y>>cost;
if(y!=1)
a[x].push_back(make_pair(y,cost));
}
c.push(1);
while(!c.empty())
{
int x=c.front();
c.pop();
v[x]=false;
for(auto y:a[x])
{
if(d[y.first]>d[x]+y.second)
{
++u[y.first];
if(u[y.first]==n)
{
out<<"Ciclu negativ!";
return 0;
}
d[y.first]=d[x]+y.second;
if(v[y.first]==false)
{
c.push(y.first);
v[y.first]=true;
}
}
}
}
for(int i=2;i<=n;++i)
out<<d[i]<<' ';
return 0;
}