Cod sursa(job #2029797)

Utilizator luanastLuana Strimbeanu luanast Data 30 septembrie 2017 14:16:53
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.88 kb
#include <fstream>
#include <vector>
using namespace std;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
int n,m,p,x,y,i,ok,v[100001],c[100001];
vector <int> L[100001];

void bfs (int nod){
    v[nod]=1;
    int p,u;
    p=u=1;
    c[1]=nod;
    while(p<=u){
        int nodc=c[p];
        for(int i=0;i<L[nodc].size();i++){
            int nodv=L[nodc][i];
            if(v[nodv]==0){
                v[nodv]=v[nodc]+1;
                ++u;
                c[u]=nodv;
            }
        }
        ++p;
    }

}



int main(){
    fin>>n>>m>>p;
    for(i=1;i<=m;i++){
        fin>>x>>y;
        ok=1;
        if(x==y)
            ok=0;
        for(int j=0;j<L[x].size();j++)
            if(y==L[x][j])
                ok=0;
        if(ok)
            L[x].push_back(y);
    }
    bfs(p);
    for(i=1;i<=n;i++){
        fout<<v[i]-1<<" ";
    }
}