Cod sursa(job #2963278)

Utilizator hhhhhhhAndrei Boaca hhhhhhh Data 10 ianuarie 2023 18:33:41
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.17 kb
#include <bits/stdc++.h>

using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
typedef pair<int,int> pii;
int n,m,dist[50005];
vector<pii> muchii[50005];
bool use[50005];
void bfs()
{
    for(int i=2;i<=n;i++)
        dist[i]=1e9+5;
    set<pii> coada;
    coada.insert({dist[1],1});
    use[1]=1;
    while(!coada.empty())
    {
        int nod=(*coada.begin()).second;
        coada.erase(coada.begin());
        for(int i=0;i<muchii[nod].size();i++)
        {
            int fiu=muchii[nod][i].first;
            int cost=muchii[nod][i].second;
            if(dist[fiu]>dist[nod]+cost&&!use[fiu])
            {
                dist[fiu]=dist[nod]+cost;
                coada.insert({dist[fiu],fiu});
                use[fiu]=1;
            }
        }
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    fin.tie(0);
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int a,b,c;
        fin>>a>>b>>c;
        muchii[a].push_back({b,c});
    }
    bfs();
    for(int i=2;i<=n;i++)
    {
        if(dist[i]>1e9)
            fout<<0<<' ';
        else
            fout<<dist[i]<<' ';
    }
    return 0;
}