Cod sursa(job #3304058)

Utilizator CheeseEaterHackRoman Alex CheeseEaterHack Data 20 iulie 2025 09:36:27
Problema Algoritmul Bellman-Ford Scor 0
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.27 kb
#include <bits/stdc++.h>
using namespace std;

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

const int INF=1e8+1;

int n, m, a, b, c;
vector<pair<int, int>> graf[50001];
int dist[50001];
int fr[50001];

int main()
{
    fin>>n>>m;
    for (int i=1; i<=m; i++)
    {
        fin>>a>>b>>c;
        graf[a].emplace_back(b, c);
    }
    for (int i=1; i<=n; i++)
    {
        dist[i]=INF;
    }
    dist[1]=0;
    
    queue<int> q;
    q.push(1);
    fr[1]=1;
    
    bool ok=true;
    
    while (!q.empty() and ok)
    {
        int nod=q.front();
        q.pop();
        fr[nod]=-fr[nod];
        for (auto [vecin, cost]: graf[nod])
        {
            if (dist[vecin]>dist[nod]+cost)
            {
                dist[vecin]=dist[nod]+cost;
                if (fr[vecin]<0)
                {
                    fr[nod]=-fr[nod];
                    continue;
                }
                fr[vecin]++;
                if (fr[vecin]>n)
                {
                    ok=false;
                    break;
                }
                q.push(vecin);
            }
        }
    }
    if (!ok)
    {
        fout<<"Ciclu negativ!";
    }
    else
    {
        for (int i=2; i<=n; i++)
        {
            fout<<dist[i]<<" ";
        }
    }
    
    return 0;
}