Cod sursa(job #2812436)

Utilizator mateilazarescumateilazarescu mateilazarescu Data 4 decembrie 2021 15:35:28
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.8 kb
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,s,i,u,v;
vector<int> adj[100005];
queue<int> q;
int ver[100005];
void bfs(int x)
{
    int i;
    q.push(x);
    ver[x]=1;
    while(!q.empty())
    {
        x=q.front();
        q.pop();
        for(i=0;i<adj[x].size();i++)
        {
            if(ver[adj[x][i]]==0)
            {
                q.push(adj[x][i]);
                ver[adj[x][i]]=ver[x]+1;
            }
        }
    }
    for(i=1;i<=n;i++)
    {
        if(ver[i]==0) fout<<-1<<" ";
        else fout<<ver[i]-1<<" ";
    }
}
int main()
{
    fin>>n>>m>>s;
    for(i=1;i<=m;i++)
    {
        fin>>u>>v;
        adj[u].push_back(v);
    }
    bfs(s);

    return 0;
}