Cod sursa(job #2431259)

Utilizator georgeoctavianGeorge Octavian Grumazescu georgeoctavian Data 18 iunie 2019 18:56:25
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.91 kb
#include <bits/stdc++.h>
using namespace std;
ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");
int n,m,x,y,cost,d[50010],fr[50010];
vector <pair<int,int>> v[50010];
queue <int> q;
int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y>>cost;
        v[x].push_back(make_pair(y,cost));
    }
    for(int i=2;i<=n;i++)
        d[i]=9999999;
    q.push(1);
    d[1]=0;
    while(!q.empty())
    {
        int a=q.front();
        q.pop();
        fr[a]++;
        if(fr[a]>=m)
        {
            fout<<"Ciclu negativ!";
            return 0;
        }
        for(auto i : v[a])
        {
            pair <int,int> b=i;
            if(d[b.first]>b.second+d[a])
            {
                d[b.first]=b.second+d[a];
                q.push(b.first);
            }
        }
    }
    for(int i=2;i<=n;i++)
        fout<<d[i]<<' ';
    return 0;
}