Cod sursa(job #2183191)

Utilizator alexkosaAlex Kosa alexkosa Data 22 martie 2018 21:45:37
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <queue>
#include <vector>

using namespace std;

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

int n,s,m,viz[100003],sol[100003];
vector<int>v[100003];
queue<int>coada;

void bfs(int nod)
{
    coada.push(nod);
    viz[nod]=1;
    sol[nod]=0;
    while(!coada.empty())
    {
        int y=coada.front();
        coada.pop();
        for(vector<int> :: iterator it=v[y].begin();it!=v[y].end();it++)
        {
            if(viz[*it]==0)
            {
                sol[*it]=sol[y]+1;
                viz[*it]=1;
                coada.push(*it);
            }
        }
    }
}

int main()
{
    fin>>n>>m>>s;
    int x,y;
    for(int i=1;i<=m;i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
        sol[i]=-1;
    bfs(s);
    for(int i=1;i<=n;i++)
        fout<<sol[i]<<" ";
}