Mai intai trebuie sa te autentifici.
Cod sursa(job #696501)
Utilizator | Data | 28 februarie 2012 18:47:05 | |
---|---|---|---|
Problema | Algoritmul lui Dijkstra | Scor | 40 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 1.14 kb |
#include<cstdio>
#include<vector>
using namespace std;
int nN, nM;
struct muchie
{
int nod,cost;
};
vector<muchie > lAd[50010];
int dist[50010];
void bford();
int main()
{
FILE *fin = fopen("dijkstra.in", "r");
fscanf(fin, "%d %d", &nN, &nM);
int inod1,inod2,icost;
for (int i=1; i<=nM; i++)
{
fscanf(fin, "%d %d %d", &inod1, &inod2, &icost);
muchie tmp;
tmp.nod=inod2; tmp.cost=icost;
lAd[inod1].push_back(tmp);
}
bford();
FILE *fout = fopen("dijkstra.out", "w");
for (int i=2; i<=nN; i++)
fprintf(fout, "%d ", dist[i]==1<<30?0:dist[i]);
return 0;
}
void bford()
{
dist[1]=0;
for (int i=2;i<=nN;i++)
dist[i]=1<<30;
for (int i=1; i<=nN-1; i++)
for (int j=1; j<=nN; j++)
for (int k=0; k<lAd[j].size(); k++)
{
int curnod1=j;
int curnod2=lAd[j].at(k).nod;
int costmuchie12=lAd[j].at(k).cost;
if (dist[curnod1]+costmuchie12<dist[curnod2])
dist[curnod2]=dist[curnod1]+costmuchie12;
}
}