Cod sursa(job #3338789)

Utilizator alexandra_popaa13Popa Alexandra alexandra_popaa13 Data 5 februarie 2026 09:22:37
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.2 kb
#include <fstream>
#include <vector>
#include <queue>
#define NMAX 50002
#define INF 1000000000
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
struct arc
{
    int vf,c;
};

vector<arc> G[NMAX];
int n,m,start=1;
int cmin[NMAX];
int nr[NMAX];
bool circuitneg=0;
queue<int>C;

int main()
{
    int i,x,y,cost;
    //citire
    fin>>n>>m;
    for(i=1; i<=m; i++)
    {
        fin>>x>>y>>cost;
        G[x].push_back({y,cost});
    }
    //initializare
    for(i=1; i<=n; i++) cmin[i]=INF;
    cmin[start]=0;
    C.push(start);
    while(!C.empty() && !circuitneg)
    {
        x=C.front();
        C.pop();
        //parcurg lista de adiacenta a lui x
        for(i=0; i<G[x].size(); i++)
        {
            y=G[x][i].vf;
            cost=G[x][i].c;
            if(cmin[y]>cmin[x]+cost)
            {
                cmin[y]=cmin[x]+cost;
                nr[y]++;
                if(nr[y]==n) circuitneg=1;
                else C.push(y);
            }
        }
    }
    if(circuitneg)
        fout<<"Ciclu negativ!";
        else
        {
        for(i=2; i<=n; i++)
            fout<<cmin[i]<<' ';
        }
    return 0;
}