Pagini recente » Cod sursa (job #790963) | Borderou de evaluare (job #2508820) | Cod sursa (job #1362991) | Diferente pentru problema/captcha intre reviziile 3 si 4 | Cod sursa (job #3337892)
#include <fstream>
#include <vector>
#include <set>
#define INF 1000000000
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
vector< pair<int, long long> > v[50002];
set < pair< long long , int> > s; // scoate minimul
long long d[50002];
int main()
{
int n,m, a, b, c;
fin>>n>>m;
for(int i=1;i<=m;i++){
fin>>a>>b>>c; // a--cost c->b
v[a].push_back( make_pair(b, c) );
}
for(int i=1;i<=n;i++){
d[i] = INF;
}
d[1]=0;
s.insert( make_pair(0,1) );
while( !s.empty() ){
int nod = s.begin()->second;
long long dist = s.begin()->first; // s[nod]=1;
s.erase( s.begin() );
for(vector<pair<int, long long>> :: iterator it = v[nod].begin(); it != v[nod]. end(); it++){
int vecin = it -> first;
long long dist_vecin = it -> second;
if(dist + dist_vecin < d[vecin]){
// ( d[vecin], vecin) scoatem si bagam (dist + dist_vecin, vecin)
if( s.find( make_pair(d[vecin], vecin) ) != s.end())
s.erase( s.find(make_pair(d[vecin], vecin)) ) ;
s.insert( make_pair(dist + dist_vecin, vecin) );
d[vecin] = dist + dist_vecin, vecin;
}
}
}
for(int i=2; i<=n; i++)
if(d[i]==INF)fout<<0<<' ';
else fout<<d[i]<<' ';
return 0;
}