Cod sursa(job #2045650)

Utilizator denismanaManaila Denis Daniel denismana Data 22 octombrie 2017 17:52:40
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.87 kb
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
int n,m,nod;
vector <int> v[100001],d;
void declarare_d()
{
    int i;
    for(i=0;i<=n;i++)
        d.push_back(0);
}
void citire()
{
    int i,x,y;
    in>>n>>m>>nod;
    for(i=1;i<=m;i++){
        in>>x>>y;
        v[x].push_back(y);
    }
}
void lat()
{
    int i;
    declarare_d();
    queue <int> q;
    q.push(nod);
    for(i=1;i<=n;i++)
        if(i!=nod)
            d[i]=-1;
    while(!q.empty())
    {
        int x=q.front();
        q.pop();
        for(i=0;i<v[x].size();i++)
        {
            int vecin=v[x][i];
            if(d[vecin]==-1)
            {
                d[vecin]=d[x]+1;
                q.push(vecin);
            }
        }
    }
    for(i=1;i<=n;i++)
        out<<d[i]<<" ";
}
int main()
{
    citire();
    lat();
    return 0;
}