Cod sursa(job #2955161)

Utilizator alessiamtr12Mitrica Alessia alessiamtr12 Data 16 decembrie 2022 14:58:14
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.89 kb
#include <fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,s,x,y;
int d[100001];
queue<int>q;
vector<int>v[100001];
bool viz[100001];
void bfs(int nod)
{
    viz[nod]=1;
    q.push(nod);
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        for(int i=0;i<v[nod].size();i++)
        {
            int nod1=v[nod][i];
            if(viz[nod1]==0)
            {
                viz[nod1]=1;
                d[nod1]=d[nod]+1;
                q.push(nod1);
            }
        }
    }
}
int main()
{
    fin>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    d[s]=0;
    bfs(s);
    for(int i=1;i<=n;i++)
    {
        if(i!=s&&d[i]==0)
            fout<<-1<<" ";
        else
           fout<<d[i]<<" ";
    }
    return 0;
}