Cod sursa(job #2990684)

Utilizator IandruIanis Ianachis Iandru Data 8 martie 2023 12:39:58
Problema Algoritmul lui Dijkstra Scor 20
Compilator cpp-32 Status done
Runda Arhiva educationala Marime 1.24 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <queue>

using namespace std;

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

const int NMAX=200005;

vector < pair < int,int > > G[NMAX];


int N,M,viz[NMAX],cost_total;

void citire()
{
    fin>>N>>M;
    for(int i=0;i<M;i++)
    {
        int x,y,c;
        fin>>x>>y>>c;
        G[x].push_back({y,c});
    }

}

priority_queue <pair <int,int>> q;
int sol[NMAX];

void prim()
{

    for(int i=1;i<=N;i++)
    {
        sol[i]=NMAX;
    }
    q.push({0,1});
    while(!q.empty())
    {
        auto cap = q.top();
        int nodc = cap.second;
        int cost = -cap.first;
        q.pop();
        if(viz[nodc])
            continue;
        viz[nodc]=1;
        for(auto el: G[nodc])
        {
            if(!viz[el.first])
            {
                if(cost+el.second<sol[el.first])
                {
                    sol[el.first]=cost+el.second;
                    q.push({-(cost+el.second),el.first});
                }
            }
        }
    }
    for(int i=2;i<=N;i++)
    {
       fout<< sol[i]<<" ";
    }

}



int main()
{
    citire();
    prim();
    return 0;
}