Cod sursa(job #2473875)

Utilizator Dan_BDan Bugnariu Dan_B Data 14 octombrie 2019 14:01:01
Problema Algoritmul lui Dijkstra Scor 60
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.09 kb
#include <bits/stdc++.h>
#define INF 1 << 30
using namespace std;
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");

vector<pair<int,int> > lista[50002];
int n,m,x,y,d;
int a[50002];
queue<int>q;
bool in_coada[500005];

void dijkstra(int node)
{
    q.push(node);
    in_coada[node]=1;
    while(!q.empty())
    {
        int b=q.front();
        in_coada[b]=0;
        q.pop();
        for(auto c:lista[b])
        {
            if(a[b]+c.second<a[c.first])
            {
                a[c.first]=a[b]+c.second;
                if(!in_coada[c.first])
                {
                    q.push(c.first);
                    in_coada[node]=1;
                }
            }
        }
    }
}
int main()
{
    a[0]=INF;
    in>>n>>m;
    for(int i=1;i<=m;i++)
    {
        in>>x>>y>>d;
        lista[x].push_back({y,d});
    }
    for(int i=2;i<=m;i++)
    {
        a[i]=INF;
    }
    dijkstra(1);
    for(int i=2;i<=n;i++)
    {
        if(a[i]==a[0])
            out<<0<<' ';
        else
            out<<a[i]<<' ';
    }
    return 0;
}