Cod sursa(job #2695015)

Utilizator DariusGhercaDarius Gherca DariusGherca Data 11 ianuarie 2021 15:16:59
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.37 kb
#include <bits/stdc++.h>
using namespace std;
const int INFINIT=INT_MAX;
const int N=5e4+10;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
struct pct{
    int nod,cost;
};
vector <pct> a[N];
int n;
bool sel[N];
int pred[N];
int d[N];
int main()
{
    int m;
    f>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y,z;
        f>>x>>y>>z;
        pct aux;
        aux.cost=z;
        aux.nod=y;
        a[x].push_back(aux);
    }
    for(int j=2;j<=n;j++)
    {
        d[j]=INFINIT;
    }
    d[1]=0;
    deque <pct> q;
    pct aux;
    aux.nod=1;
    aux.cost=0;
    q.push_front(aux);
    while(!q.empty())
    {
        while(!q.empty() && sel[q.front().nod])
        {
            q.pop_front();
        }
        if(q.empty())
        {
            break;
        }
        int x=q.front().nod;
        sel[x]=true;
        q.pop_front();
        for(auto m:a[x])
        {
            int y=m.nod;
            int c=m.cost;
            if(d[x]+c<d[y])
            {
                d[y]=d[x]+c;
                pred[y]=x;
                pct aux;
                aux.nod=y;
                aux.cost=-d[y];
                q.push_front(aux);
            }
        }
    }
    for(int i=2;i<=n;i++)
    {
        if(d[i]==INFINIT)
        g<<0<<" ";
        else
        g<<d[i]<<" ";
    }
    return 0;
}