Cod sursa(job #2989844)

Utilizator MacraAlexandruMacra Alexandru MacraAlexandru Data 7 martie 2023 09:01:41
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.02 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});
        //v[y].push_back({x, c});
    }
}
bool bford(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(bford(1))g<<"Ciclu negativ!";
    else for(int i=2; i<=n; i++)g<<d[i]<<" ";
}
int main()
{
    citire();
    rez();
    return 0;
}