Cod sursa(job #2140239)

Utilizator TudorFinaruTudor Cristian Finaru TudorFinaru Data 23 februarie 2018 09:32:25
Problema BFS - Parcurgere in latime Scor 80
Compilator cpp Status done
Runda Arhiva educationala Marime 0.92 kb
#include <fstream>
#include<set>
#include<queue>
#include<list>
#include<bitset>

using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int n,m,s,x,y,nod,nou,cost[100003];
bitset <100003> vizit;

list<int>v[100003];

queue<int> c;

list<int> ::iterator it;

int main()
{
    int i;
    f>>n>>m>>s;
    for(i=1;i<=m;i++)
    {
        f>>x>>y;
        v[x].push_back(y);
    }
    for(i=1;i<=n;i++)
        cost[i]=-1;
    cost[s]=0;
    c.push(s);
    while(c.size()>0)
    {
        nod=c.front();
        vizit[nod]=1;
        for(it=v[nod].begin();it!=v[nod].end();++it)
        {
            nou=*it;
            if(vizit[nou]==0 && cost[nou]==-1)
            {
                c.push(nou);
                cost[nou]=cost[nod]+1;
            }
        }
        c.pop();
    }
    for(i=1;i<=n;i++) g<<cost[i]<<' ';
    g<<'\n';
    f.close();
    g.close();
    return 0;
}