Cod sursa(job #1002767)

Utilizator oprea1si2si3Oprea Sebastian oprea1si2si3 Data 28 septembrie 2013 19:39:53
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.8 kb
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
int n,m,start,d[100010];
queue <int> Queue;
vector <int> v[100010];
void BFS(int start)
{
    int i,nod,vecin;
    for(i=1;i<=n;i++)
        d[i]=-1;
    d[start]=0;
    Queue.push(start);
    while(!Queue.empty()){
    nod=Queue.front();Queue.pop();
    for(i=0;i<v[nod].size();i++){
        vecin=v[nod][i];
        if(d[vecin]!=-1)
            continue;
        Queue.push(vecin);
        d[vecin]=d[nod]+1;
        }

    }
}

int main ()
{
    int i,x,y;
    in>>n>>m>>start;
    for(int i=1;i<=m;i++){
        in>>x>>y;
        v[x].push_back(y);
    }
    BFS(start);
    for(i=1;i<=n;i++)
        out<<d[i]<<" ";
    out<<'\n';
    return 0;
}