Cod sursa(job #3284195)

Utilizator tudor_costinCostin Tudor tudor_costin Data 11 martie 2025 11:18:22
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.24 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
const int Nmax=50005;
long long cost[Nmax];
vector<pair<long long,long long>>v[Nmax];
int viz[Nmax];
bitset<Nmax> inq;
queue<int>q;
int main()
{
    int n,m;
    fin>>n>>m;
    long long x,y,c;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>c;
        v[x].push_back({y,c});
    }
    for(int i=1;i<=n;i++) cost[i]=LLONG_MAX;
    q.push(1);
    inq[1]=1;
    cost[1]=0;
    while(!q.empty())
    {
        long long nod=q.front();
        inq[nod]=0;
        q.pop();
        for(int i=0;i<v[nod].size();i++)
        {
            long long next=v[nod][i].first;
            long long ct=v[nod][i].second;
            if(cost[next]>ct+cost[nod])
            {
                cost[next]=cost[nod]+ct;
                viz[next]++;
                if(!inq[next])
                {
                    q.push(next);
                    inq[next]=1;
                }
            }
            if(viz[next]>n)
            {
                fout<<"Ciclu negativ!";
                return 0;
            }
        }
    }
    for(int i=2;i<=n;i++)
    {
        fout<<cost[i]<<' ';
    }
    return 0;
}