Cod sursa(job #3001198)

Utilizator MorarCezarMorar Cezar MorarCezar Data 13 martie 2023 12:40:44
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.03 kb
#include <bits/stdc++.h>

using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
int n,m,viz[50001],d[50001];
vector<pair<int,int>>v[50001];
void citire()
{
    f>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int x,y,c;
        f>>x>>y>>c;
        v[x].push_back({y,c});

    }
}
bool bellmanford(int vf)
{
    queue<int>q;
    for(int i=1;i<=n;i++)
        d[i]=INT_MAX,viz[i]=0;
    d[vf]=0;
    viz[vf]=1;
    q.push(vf);
    while(!q.empty())
    {
        int x=q.front();
        q.pop();
        viz[x]++;
        if(viz[x]==n)return true;
        for(auto i:v[x])
        {
            int vcn=i.first, cst=i.second;
            if(d[x]+cst<d[vcn])
            {
                d[vcn]=d[x]+cst;
                q.push(vcn);
            }
        }
    }
    return false;
}
void rez()
{
    if(bellmanford(1))
        g<<"Ciclu negativ!";
    else
        for(int i=2;i<=n;i++)
            g<<d[i]<<" ";
}
int main()
{
    citire();
    rez();
    return 0;
}