Cod sursa(job #2721861)

Utilizator mjmilan11Mujdar Milan mjmilan11 Data 12 martie 2021 12:53:51
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.21 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");
const int NMAX = 50005;
const int MMAX = 250005;
const int INF = (1<<29);
vector < pair<int,int> > v[NMAX];
priority_queue < pair<int,int> > q;
bool fixat[NMAX];
int n,dist[NMAX],m,x,y,cost;
void init(){
    for(int i=1;i<=n;i++) dist[i]=INF;
    dist[1]=0;
}
void dijkstra(){
    q.push({0,1});
    while(!q.empty()){
        while(!q.empty() and fixat[q.top().second]==true) q.pop();
        if(q.empty()) return;
        pair<int,int> aux=q.top();
        int node=aux.second;
        fixat[node]=true;
        for(int i=0;i<v[node].size();i++){
            int vecin=v[node][i].first;
            int costt=v[node][i].second;
            if(dist[node]+costt<dist[vecin]){
                dist[vecin]=dist[node]+costt;
            }
            q.push({-dist[vecin],vecin});
        }
    }
}
int main()
{
    fin >> n >> m;
    for(int i=1;i<=m;i++){
        fin >> x >> y >> cost;
        v[x].push_back({y,cost});
    }
    init();
    dijkstra();
    for(int i=2;i<=n;i++){
        if(dist[i]!=INF) fout << dist[i] << ' ';
        else fout << 0 << ' ';
    }
    return 0;
}