Mai intai trebuie sa te autentifici.
Cod sursa(job #1912445)
Utilizator | Data | 8 martie 2017 08:58:56 | |
---|---|---|---|
Problema | Algoritmul lui Dijkstra | Scor | 20 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 1.21 kb |
#include <bits/stdc++.h>
#define inf 2000000000
using namespace std;
int n,m,d[50003];
bool viz[50003];
vector <pair <int,int>> L[50003];
void Citire()
{
int x,y,c;
ifstream fin("dijkstra.in");
fin>>n>>m;
for(int i=1;i<=m;i++)
{
fin>>x>>y>>c;
L[x].push_back({y,c});
}
fin.close();
}
void Dijkstra(int start)
{
int i,x,y,c;
unsigned int ui;
priority_queue<pair <int,int>> q;
for(i=1;i<=n;i++)
d[i]=inf;
d[start]=0;
q.push({0,start});
while(!q.empty())
{
x=q.top().second;
q.pop();
if(viz[x]==0)
{
viz[x]=1;
for(ui=0;ui<L[x].size();ui++)
{
y=L[x][ui].first;
c=L[x][ui].second;
if(d[y]>d[x]+c)
{
d[y]=d[x]+c;
q.push({d[y],y});
}
}
}
}
}
void Afisare()
{
ofstream fout("dijkstra.out");
for(int i=2;i<=n;i++)
if(d[i]!=inf) fout<<d[i]<<" ";
else fout<<0<<" ";
fout.close();
}
int main()
{
Citire();
Dijkstra(1);
Afisare();
return 0;
}