Mai intai trebuie sa te autentifici.
Cod sursa(job #1279897)
Utilizator | Data | 1 decembrie 2014 00:56:42 | |
---|---|---|---|
Problema | Algoritmul lui Dijkstra | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 1.67 kb |
#include <cstdio>
#include <queue>
#include <vector>
using namespace std;
#define INFINIT 1<<30
#define MAXN 50010
typedef vector<int> VI;
VI d;
struct nod{int nd; int cost; nod *next;};
nod *L[MAXN];
int n, S, m, uz[MAXN];
struct Comp{
bool operator() (int i, int j)
{
return d[i]<d[j];
}
};
queue<int> Q;
void citire()
{
nod *p;
int x, y, cost,i;
scanf("%d%d", &n, &m);
for(i=1;i<=m;++i)
{
scanf("%d%d%d", &x, &y, &cost);
p=new nod;
p->nd=y;
p->cost=cost;
p->next=L[x];
L[x]=p;
}
S=1;
}
void Dijkstra()
{
d.assign(n+1, INFINIT);
d[S]=0;
uz[S]=1;
Q.push(S);
int k;
while(!Q.empty())
{
k=Q.front();
Q.pop();
uz[k]=0;
nod *p=L[k];
while(p)
{
if(d[p->nd]>d[k]+p->cost)
{
d[p->nd]=d[k]+p->cost;
if(!uz[p->nd])
{
Q.push(p->nd);
uz[p->nd]=1;
}
}
p=p->next;
}
/* for(i=2;i<=n;++i)
{
if(d[i]>d[k]+c[k].v[i])
{
d[i]=d[k]+c[k].v[i];
Q.push(i);
}
}*/
}
}
void afisare()
{
int i;
for(i=2;i<=n;++i)
if(d[i]!=INFINIT)
printf("%d ", d[i]);
else
printf("0 ");
}
void rezolva_problema()
{
citire();
Dijkstra();
afisare();
}
int main()
{
freopen("dijkstra.in", "r", stdin);
freopen("dijkstra.out", "w", stdout);
rezolva_problema();
return 0;
}