Cod sursa(job #2711338)

Utilizator vladadAndries Vlad Andrei vladad Data 23 februarie 2021 22:43:43
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.15 kb
#include<bits/stdc++.h>
#define fi first
#define sc second
#define int long long
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int n, m, dis[50001], x;
vector<pair<int, int>>v[50001];
set<pair<int, int>>s;
bool viz[50001];
void dijkstra(int nod)
{
    viz[nod]=1;
    for(int i=0; i<v[nod].size(); i++)
    {
        if(!viz[v[nod][i].fi])
        {
            viz[v[nod][i].fi]=1;
            dis[v[nod][i].fi]=dis[nod]+v[nod][i].sc;
            s.insert({dis[v[nod][i].fi], v[nod][i].fi});
        }
        else if(dis[v[nod][i].fi]>dis[nod]+v[nod][i].sc)
        {
            s.erase({dis[v[nod][i].fi], v[nod][i].fi});
            dis[v[nod][i].fi]=dis[nod]+v[nod][i].sc;
            s.insert({dis[v[nod][i].fi], v[nod][i].fi});
        }
    }

}
main()
{
    f>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int x, y, c;
        f>>x>>y>>c;
        v[x].push_back({y, c});
    }
    s.insert({0, 1});
    while(!s.empty())
    {
        int a=(*s.begin()).sc;
        s.erase(s.begin());
        dijkstra(a);
    }
    for(int i=2; i<=n; i++)
        g<<dis[i]<<' ';
    return 0;
}