Cod sursa(job #2751205)

Utilizator dariateodaria teodorescu dariateo Data 14 mai 2021 16:06:20
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.31 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <set>
#define INF 1<<30
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

struct chestii{
    int cost,nod;
};
vector <chestii> lista[50003];
int dist[50003];
int n,m,p,min1,nod,vec;

void dijkstra(int p)
{
    for(int i=1;i<=n;i++)
        dist[i]=INF;
    dist[p]=0;
    set<pair<int,int> > s;
    s.insert(make_pair(0,p));
    int p2=0;
    while(!s.empty())
    {
        nod=s.begin()->second;
        min1=s.begin()->first;
        s.erase(s.begin());
        for(int j=0;j<lista[nod].size();j++)
        {
            vec=lista[nod][j].nod;
            if (dist[vec]>min1+lista[nod][j].cost)
            {
                if(dist[vec]!=INF)
                    s.erase(s.find(make_pair(dist[vec],vec)));
                dist[vec]=min1+lista[nod][j].cost;
                s.insert(make_pair(dist[vec],vec));
            }
        }
    }
}

int main()
{
    fin>>n>>m;
    chestii t;
    for(int i=1;i<=m;i++)
    {
        int x,y,c;
        fin>>x>>y>>c;
        t.nod=y;
        t.cost=c;
        lista[x].push_back(t);
    }
    dijkstra(1);
    for(int i=2;i<=n;i++)
    {
        if(dist[i]!=INF) fout<<dist[i]<<" ";
        else fout<<"0 ";
    }
    return 0;
}