Cod sursa(job #2722333)

Utilizator FastmateiMatei Mocanu Fastmatei Data 12 martie 2021 19:14:00
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.05 kb
#include <bits/stdc++.h>
#define oo 1999980000

using namespace std;

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

int n,m;
vector<pair<int,int> > v[50005];
int d[50005];
int viz[50005];
priority_queue<pair<int,int> > q;

void Dijkstra(int k)
{
    q.push({0,k});
    d[k]=0;
    while(!q.empty())
    {
        k=q.top().second;
        q.pop();
        if(viz[k]==0)
        {
            viz[k]=1;
            for(auto w:v[k])
            {
                int x,y;
                x=w.first;
                y=w.second;
                if(d[x]>d[k]+y)
                {
                    d[x]=d[k]+y;
                    q.push({-d[x],x});
                }
            }
        }
    }
}

int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y,c;
        fin>>x>>y>>c;
        v[x].push_back({y,c});
    }
    for(int i=1;i<=n;i++)
        d[i]=oo;
    Dijkstra(1);
    for(int i=2;i<=n;i++)
        if(d[i]==oo) fout<<"0 ";
        else fout<<d[i]<<" ";
    return 0;
}