Cod sursa(job #2471798)

Utilizator mjmilan11Mujdar Milan mjmilan11 Data 11 octombrie 2019 15:45:39
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.13 kb
#include <bits/stdc++.h>

using namespace std;

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

const int NMAX = 50005;
const int INF = (1<<29);

vector < pair<int,int> > v[NMAX];
priority_queue < pair<int,int> > q;
int dist[NMAX];
bool fix[NMAX];

void dijkstra()
{
    for(int i=1;i<=NMAX;i++) dist[i]=INF;
    dist[1]=0;
    q.push({0,1});
    while(!q.empty())
    {
        while(!q.empty() and fix[q.top().second]==true)
            q.pop();
        if(q.empty()) return;
        int nod=q.top().second;
        fix[nod]=true;
        for(int i=0;i<v[nod].size();i++)
        {
            int vecin=v[nod][i].first;
            int lg=v[nod][i].second;
            if(dist[vecin]>dist[nod]+lg) dist[vecin]=dist[nod]+lg;
            q.push({-dist[vecin],vecin});
        }
    }
}

int main()
{
    int n,m,x,y,cost;
    fin >> n >> m;
    for(int i=1;i<=m;i++)
    {
        fin >> x >> y >> cost;
        v[x].push_back({y,cost});
    }
    dijkstra();
    for(int i=2;i<=n;i++)
    {
        if(dist[i]!=INF) fout << dist[i] << ' ';
        else fout << 0 << ' ';
    }
    return 0;
}