Pagini recente » Cod sursa (job #29980) | Cod sursa (job #2067636) | Profil brares | Cod sursa (job #432959) | Cod sursa (job #1233235)
#include<cstdio>
#include<set>
#include<vector>
#define dmax 2000000000
using namespace std;
vector< pair<int,int> >L[50100];
vector< pair<int,int> >::iterator it;
set< pair<int,int> >s;
set< pair<int,int> >::iterator itt;
int n,m,i,j,d[50100],v[50100],a,b,c,ok,vmin,poz;
FILE *f,*g;
int main(){
f=fopen("dijkstra.in","r");
g=fopen("dijkstra.out","w");
fscanf(f,"%d%d",&n,&m);
for(i=1;i<=m;i++){
fscanf(f,"%d%d%d",&a,&b,&c);
L[a].push_back(make_pair(b,c));
}
for(i=2;i<=n;i++){
d[i]=dmax;
s.insert(make_pair(dmax,i));
}
d[1]=0;
s.insert(make_pair(0,1));
while(!ok&&!s.empty()){
itt=s.begin();
vmin=itt->first;
if(vmin==dmax)
break;
poz=itt->second;
v[poz]=1;
s.erase(itt);
for(it=L[poz].begin();it!=L[poz].end();it++){
if(d[it->first]>d[poz]+it->second){
s.erase(s.find(make_pair(d[it->first],it->first)));
d[it->first]=d[poz]+it->second;
s.insert(make_pair(d[it->first],it->first));
}
}
}
for(i=2;i<=n;i++){
if(d[i]==dmax)
fprintf(g,"0 ");
else
fprintf(g,"%d ",d[i]);
}
fclose(f);
fclose(g);
return 0;
}