Cod sursa(job #2840307)

Utilizator alexdumitruAlexandru Dumitru alexdumitru Data 27 ianuarie 2022 13:02:10
Problema Algoritmul Bellman-Ford Scor 100
Compilator cpp-64 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 cost[50005],n,m,i,j,u,v,c,vis[50005],viz[50005];
bool in[50005];
vector<pair<int,int> >g[50005];
queue<int> q;
bool bellmanford()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        fin>>u>>v>>c;
        g[u].push_back({v,c});
    }
    for(int i=2;i<=n;i++)
        cost[i]=(1<<30);
    q.push(1);
    in[1]=1;
    viz[1]=1;
    while(!q.empty())
    {
        int nod=q.front();
        in[nod]=0;
        vis[nod]++;
        q.pop();
        if(vis[nod]>=n)return 0;
        for(auto it:g[nod])
            if(cost[nod]+it.second<cost[it.first])
        {
            if(!in[it.first])
            {
                in[it.first]=1;
                q.push(it.first);
            }
            cost[it.first]=cost[nod]+it.second;
        }

    }
    return 1;
}
int main()
{
    if(bellmanford())
    {
        for(int i=2;i<=n;i++)
            fout<<cost[i]<<' ';
        return 0;
    }
    fout<<"Ciclu negativ!";
    return 0;
}