Cod sursa(job #2486503)

Utilizator verde.cristian2005Verde Flaviu-Cristian verde.cristian2005 Data 2 noiembrie 2019 23:14:28
Problema Algoritmul Bellman-Ford Scor 35
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.12 kb
#include <bits/stdc++.h>
using namespace std;
const int N=50000;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
priority_queue <pair<long long,int>> coada;
vector <pair<int,int>> v[N+1];
bool incoada[N+1];
long long drum[N+1];
int main()
{
    int n,m,y,x,i,c;
    in>>n>>m;
    for(i=1; i<=m; i++)
    {
        in>>x>>y>>c;
        v[x].push_back({y,c});
    }
    for(i=2; i<=n; i++)
        drum[i]=(1LL<<45);
    incoada[1]=true;
    coada.push({0LL,1});
    while(!coada.empty())
    {
        x=coada.top().second;
        incoada[x]=false;
        coada.pop();
        for(i=0; i<v[x].size(); i++)
        {
            y=v[x][i].first;
            c=v[x][i].second;
            if(drum[y]>drum[x]+c)
            {
                drum[y]=drum[x]+c;
                if(incoada[y]==false)
                {
                    incoada[y]=true;
                    coada.push({-drum[y],y});
                }
            }
        }
    }
    for(i=2; i<=n; i++)
        if(drum[i]==(1LL<<45))
            out<<"0 ";
        else
            out<<drum[i]<<" ";
    return 0;
}