Cod sursa(job #1675895)

Utilizator GinguIonutGinguIonut GinguIonut Data 5 aprilie 2016 17:06:00
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.96 kb
#include <fstream>
#include <limits.h>
#include <vector>
#include <queue>

#define nMax 100001
#define pb push_back
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n, m, S;
int viz[nMax];
vector<int> G[nMax];
queue<int> Q;
void read()
{
    int a, b;
    fin>>n>>m>>S;

    for(int i=1;i<=m;i++)
    {
        fin>>a>>b;
        G[a].pb(b);
    }
}
void solve()
{
    for(int i=1;i<=n;i++)
        viz[i]=-1;
    viz[S]=0;

    for(Q.push(S);!Q.empty();)
    {
        int node=Q.front();
        Q.pop();

        for(vector<int>::iterator it=G[node].begin();it!=G[node].end();it++)
        {
            int fiu=*it;

            if(viz[fiu]==-1)
            {
                viz[fiu]=viz[node]+1;
                Q.push(fiu);
            }
        }
    }
}
void write()
{
    for(int i=1;i<=n;i++)
        fout<<viz[i]<<" ";
}
int main()
{
    read();
    solve();
    write();
    return 0;
}