Cod sursa(job #2349765)

Utilizator HoriqHoria Pacurar Horiq Data 20 februarie 2019 18:15:20
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.09 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream cin("dijkstra.in");
ofstream cout("dijkstra.out");
typedef pair<int,int>ii;
typedef vector<int>vi;
typedef vector<ii>vii;
const int NMAX=100000;
const int INF=1000000000;
vector <ii>G[NMAX+5];
int main()
{
    int n,m,i,j,u,v,w,s=1;
    cin>>n>>m;
    for(i=1;i<=m;i++)
    {
        cin>>u>>v>>w;
        G[u].push_back(ii(v,w));
    }
    vi dist(n+1,INF);dist[s]=0;
    priority_queue< ii,vector<ii>,greater<ii> >pq;
    pq.push(ii(0,s));
    while(!pq.empty())
    {
        ii front=pq.top();pq.pop();
        int d=front.first,u=front.second;
        if(d>dist[u])
            continue;
        for(j=0;j<(int)G[u].size();j++)
        {
            int v=G[u][j].first,duv=G[u][j].second;
            if(dist[u]+duv<dist[v])
            {
                dist[v]=dist[u]+duv;
                pq.push(ii(dist[v],v));
            }
        }
    }
    for(i=2;i<=n;i++)
        if(dist[i]!=INF)
        cout<<dist[i]<<" ";
        else
            cout<<0<<" ";
    return 0;
}