Cod sursa(job #2964693)

Utilizator rARES_4Popa Rares rARES_4 Data 13 ianuarie 2023 18:01:32
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.31 kb
#include <iostream>
#include <queue>
#include <vector>
#include <fstream>
#include<climits>
using namespace std;
ifstream f ("dijkstra.in");
ofstream g ("dijkstra.out");
int n,m;
vector< pair<int,int> >adiacenta[100001];
int dist[100001];
bool viz[100001];
priority_queue< pair<int,int>, vector< pair<int,int> >, greater< pair<int,int> > >q;
void alg()
{
    q.push({0,1});
    while(!q.empty())
    {
        int cost = q.top().first;
        int curent = q.top().second;
        q.pop();
        if(viz[curent]== 1)
            continue;
        viz[curent] = 1;
        for(auto x:adiacenta[curent])
        {
                int next = x.first;
                int costnou = x.second;
                if(dist[next]>costnou+cost)
                {

                    q.push({cost+costnou,next});
                    dist[next] = costnou+cost;
                }
        }
    }
}
int main()
{
    f >> n >> m;
    for(int i = 1;i<=m;i++)
    {
        int x,y,c;
        f >> x >> y >> c;
        adiacenta[x].push_back({y,c});
    }
    for(int i = 1; i<=50000; i++)
        dist[i] = INT_MAX;
    alg();
    for(int i = 2;i<=n;i++)
    {
        if (dist[i] == INT_MAX)
        {
            g << 0 << " ";
        }
        else
        g << dist[i]<< " ";
    }
    return 0;
}