Cod sursa(job #2980151)

Utilizator degoCozma Diego dego Data 16 februarie 2023 11:04:41
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.3 kb
#include <bits/stdc++.h>

using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int d[50003],n,m,viz[50003];

const int inf=1e11+3;

struct cmp
{
    bool operator()(int x,int y)
    {
        return d[x]>d[y];
    }
};

vector <pair<int,int>>v[50003];

priority_queue<int,vector<int>,cmp>q;

inline void dij(int nod)
{
    for(int i=1;i<=n;i++)
        d[i]=inf;
    d[nod]=0;
    q.push(nod);
    viz[nod]=1;
    while(!q.empty())
    {
        int newnod=q.top();
        q.pop();
        viz[newnod]=0;
        for(int i=0;i<v[newnod].size();i++)
        {
            int vecin=v[newnod][i].first,cost=v[newnod][i].second;
            if(d[newnod]+cost<d[vecin])
            {
                d[vecin]=d[newnod]+cost;
                if(viz[vecin]==0)
                {
                    q.push(vecin);
                    viz[vecin]=1;
                }
            }
        }
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    f>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int x,y,c;
        f>>x>>y>>c;
        v[x].push_back(make_pair(y,c));
    }
    dij(1);
    for(int i=2;i<=n;i++)
        if(d[i]!=inf)
        g<<d[i]<<" ";
    else
        g<<"0 ";
    return 0;
}