Mai intai trebuie sa te autentifici.
Cod sursa(job #2340693)
Utilizator | Data | 10 februarie 2019 20:37:27 | |
---|---|---|---|
Problema | Algoritmul lui Dijkstra | Scor | 90 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva educationala | Marime | 1.01 kb |
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
struct arc
{
int x,y;
};
int n,d[100002],m,p,x,y,z;
bool a[100002];
vector <arc> v[100002];
queue <int> Q;
void dijkstra2(int q)
{
for(int i=1; i<=n; i++)
d[i]=999999999;
d[q]=0;
a[q]=1;
Q.push(q);
while(!Q.empty())
{
int w=Q.front();
Q.pop();
int e=v[w].size();
for(int i=0; i<e; i++)
{
int r=v[w][i].x;
int t=v[w][i].y;
if(d[r]>d[w]+t)
{
d[r]=d[w]+t;
a[r]=1;
Q.push(r);
}
}
}
}
int main()
{
f>>n>>m;
for(int i=1; i<=m; i++)
{
f>>x>>y>>z;
v[x].push_back({y,z});
}
dijkstra2(1);
for(int i=2; i<=n; i++)
{
if(a[i])
g<<d[i]<<" ";
else
g<<0<<" ";
}
return 0;
}