Cod sursa(job #2042716)

Utilizator Tataru_AdelinTataru Adelin Tataru_Adelin Data 18 octombrie 2017 22:47:25
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.08 kb
#include <bits/stdc++.h>

using namespace std;

ifstream fin("bellmanford.in");
ofstream fout("bellmanford.out");

int const oo=1e8;

int main()
{
    int n,m,x,y,c;
    fin>>n>>m;
    vector<vector<pair<int,int>>> path(n+5);
    vector<int> dist(n+5,oo);
    queue<int> q;
    bitset<50010> in_queue;
    vector<int> updated(n+5);
    for(;m;m--)
    {
        fin>>x>>y>>c;
        path[x].push_back(make_pair(y,c));
    }
    q.push(1);
    dist[1]=0;
    in_queue[1]=1;
    updated[1]++;
    int now;
    while(q.size())
    {
        now=q.front();
        q.pop();
        in_queue[now]=0;
        for(int i=0;i<path[now].size();i++)
        {
            tie(y,c)=path[now][i];
            if(dist[y]>dist[now]+c)
            {
                updated[y]++;
                dist[y]=dist[now]+c;
                if(updated[y]>=n)
                {
                    fout<<"Ciclu negativ!\n";
                    return 0;
                }
                q.push(y);
                in_queue[y]=1;

            }

        }
    }
    for(int i=2;i<=n;i++)
        fout<<dist[i]<<' ';
    return 0;
}