Cod sursa(job #1873165)

Utilizator mihnea00Duican Mihnea mihnea00 Data 8 februarie 2017 20:26:19
Problema Algoritmul lui Dijkstra Scor 70
Compilator cpp Status done
Runda Arhiva educationala Marime 1.22 kb
#include <fstream>
#include <vector>
#include <queue>
#include <functional>

using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

vector < pair < int,int > > l[250010];
priority_queue< pair < int,int > , vector < pair < int,int > > , greater < pair < int,int > > > qu;
int n,m,i,j,mix,d[50010],nr,x,y,z,k,maxi=1000000000;
bool viz[50010];

void bfssauceva(int x)
{

    //if(qu.empty()==0 && x!=1)
     //   return;
    int ko=0;
    viz[x]=1;
    for(int i=0;i<l[x].size();++i)
    {
        d[l[x][i].first]=min(d[l[x][i].first],d[x]+l[x][i].second);
        if(viz[l[x][i].first]==0)
            qu.push({d[l[x][i].first],l[x][i].first});
    }
    while(qu.empty()==0)
    {
        ko=qu.top().second;
        qu.pop();
        if(viz[ko]==0)
        {
            bfssauceva(ko);
            return;
        }
    }
}

int main()
{
    fin>>n>>m;
    for(i=1;i<=m;++i)
    {
        fin>>x>>y>>z;
        l[x].push_back({y,z});
    }
    for(i=2;i<=n;++i)
        d[i]=maxi;
    nr=1;
    k=1;
    bfssauceva(1);
    for(i=2;i<=n;++i)
    {
        if(d[i]==maxi)
            fout<<0<<" ";
        else
            fout<<d[i]<<" ";
    }
    return 0;
}