Cod sursa(job #2532863)

Utilizator TeddyDinutaDinuta Eduard Stefan TeddyDinuta Data 28 ianuarie 2020 15:37:03
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.05 kb
#include <bits/stdc++.h>

using namespace std;
ifstream in("bellmanford.in");
ofstream out("bellmanford.out");
int n,m,d[50005],x,y,z,inq[50005],cnt[50005];
vector<pair<int,int>> v[50005];
queue<int> q;
bool bellman(int nod)
{
    inq[nod]=1;
    q.push(nod);
    d[nod]=0;
    while(!q.empty())
    {
        int x=q.front();
        q.pop();
        inq[x]=0;
        for(auto it:v[x])
        {
            if(d[it.first]>d[x]+it.second)
            {
                d[it.first]=d[x]+it.second;
                cnt[it.first]++;
                if(cnt[it.first]>n-1) return 0;
                if(!inq[it.first])
                {
                    inq[it.first]=1;
                    q.push(it.first);
                }
            }
        }
    }
    return 1;
}
int main()
{
    in>>n>>m;
    for(int i=1;i<=m;i++)
    {
        in>>x>>y>>z;
        v[x].push_back({y,z});
    }
    for(int i=1;i<=n;i++) d[i]=1e6;
    if(bellman(1)) for(int i=2;i<=n;i++) out<<d[i]<<" ";
    else out<<"Ciclu negativ!";
    return 0;
}