Cod sursa(job #2449966)

Utilizator marian013Giugioiu Marian Constantin marian013 Data 21 august 2019 13:02:51
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.85 kb
#include <bits/stdc++.h>
using namespace std;
ifstream f("bellmanford.in");
ofstream g("bellmanford.out");
#define N 50005
#define INF 1 << 30
int n,m,d[N],k[N],i;
vector<pair<int,int> >G[N];
queue<int> q;
int main()
{
    f>>n>>m;
    for(i=1;i<=m;i++)
    {
        int a,b,c;
        f>>a>>b>>c;
        G[a].push_back({b,c});
    }
    for(i=1;i<=n;i++)d[i]=INF;
    d[1]=0;
    q.push(1);
    while(!q.empty()){
        int a=q.front();
        q.pop();
        k[a]++;
        if(k[a]==n){
            g<<"Ciclu negativ!";
            return 0;
        }
        for(i=0;i<G[a].size();i++){
            int b=G[a][i].first;
            int c=G[a][i].second;
            if(d[b]>d[a]+c){
                d[b]=d[a]+c;
                q.push(b);
            }
        }
    }
    for(i=2;i<=n;i++)
        g<<d[i]<<" ";
}