Cod sursa(job #2447513)

Utilizator vladadAndries Vlad Andrei vladad Data 13 august 2019 15:24:24
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.2 kb
#include<bits/stdc++.h>
#define fi first
#define sc second
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int n, m, x, y, z;
vector<pair<int, int>>v[50001];
set<pair<int, int>>s;
bool viz[50001];
int dis[50001];
void dfs(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;
            s.insert(make_pair(v[nod][i].sc+dis[nod], v[nod][i].fi));
            dis[v[nod][i].fi]=v[nod][i].sc+dis[nod];
        }
        else
        {
            if(v[nod][i].sc+dis[nod]<dis[v[nod][i].fi])
            {
                s.erase(make_pair(dis[v[nod][i].fi], v[nod][i].fi));
                dis[v[nod][i].fi]=v[nod][i].sc+dis[nod];
                s.insert(make_pair(v[nod][i].sc+dis[nod], v[nod][i].fi));
            }
        }
    }
}
int main()
{
    f>>n>>m;
    for(int i=1; i<=m; i++)
    {
        f>>x>>y>>z;
        v[x].push_back(make_pair(y, z));
    }
    s.insert(0, 1);
    while(!s.empty())
    {
        int a=(*s.begin()).sc;
        s.erase(s.begin());
        dfs(a);
    }
    for(int i=2; i<=n; i++)
        g<<dis[i]<<' ';
    return 0;
}