Cod sursa(job #2887022)

Utilizator betybety bety bety Data 8 aprilie 2022 18:06:29
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.07 kb
#include <bits/stdc++.h>
using namespace std;
ifstream in("dijkstra.in");
ofstream out("dijkstra.out");
const int lim=5e4+5;
const int inf=1e9+7;
vector<pair<int,int> > vec[lim];
struct stare
{
    int cost;
    int nod;
};
struct cmp
{
    bool operator ()(const stare &x,const stare &y)
    {return x.cost>=y.cost;}
};
priority_queue<stare,vector<stare>,cmp> pq;
int dist[lim];
int n,m,x,y,c;
int main()
{
    in>>n>>m;
    for(int i=1;i<=m;++i)
        in>>x>>y>>c,
        vec[x].push_back({y,c});
    for(int i=1;i<=n;++i)
        dist[i]=inf;
    dist[1]=0;
    pq.push({0,1});
    while(!pq.empty())
    {
        int cost=(pq.top()).cost;
        int nod=(pq.top()).nod;
        pq.pop();
        if(cost!=dist[nod])
            continue;
        for(auto p:vec[nod])
        if(dist[p.first]>cost+p.second)
        {
            dist[p.first]=cost+p.second;
            pq.push({cost+p.second,p.first});
        }
    }
    for(int i=2;i<=n;++i)
    if(dist[i]==inf) out<<0<<' ';
    else out<<dist[i]<<' ';
    out<<'\n';
    return 0;
}