Cod sursa(job #3219489)

Utilizator andreifilimonPopescu Filimon Andrei Cosmin andreifilimon Data 31 martie 2024 15:18:52
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.1 kb
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

ifstream cin("bellmanford.in");
ofstream cout("bellmanford.out");

#define MAXN 50000
#define MAXM 250000
#define INF 250000000

vector<pair<int, int>> v[MAXN+1];
queue<int> q;
vector<int> dist(MAXN+1, INF);
int f[MAXN+1];
int n, m;

void bellmanford(int poz) {
    int x, y, c, check;
    check=0;
    dist[poz]=0;
    q.push(poz);
    while(!q.empty() && check==0) {
        x=q.front();
        q.pop();
        for(auto i:v[x]) {
            y=i.first;
            c=i.second;
            if(dist[y]>dist[x]+c) {
                q.push(y);
                f[y]++;
                if(f[y]==n) check=1;
                dist[y]=dist[x]+c;
            }
        }
    }
    if(check==0) {
        int i;
        for(i=1; i<=n; i++)
            if(i!=poz)
                cout<<dist[i]<<" ";
    } else
        cout<<"Ciclu negativ!";
}

int main() {
    cin>>n>>m;
    int i, x, y, c;
    for(i=0; i<m; i++) {
        cin>>x>>y>>c;
        v[x].push_back({y, c});
    }
    bellmanford(1);
}