Cod sursa(job #2201245)

Utilizator TheGeneralArion Dan TheGeneral Data 3 mai 2018 23:28:38
Problema BFS - Parcurgere in latime Scor 80
Compilator cpp Status done
Runda Arhiva educationala Marime 0.77 kb
#include <bits/stdc++.h>
#define N 100005
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m;
vector <int> v[N];
queue <int> q;
int viz[N];
int dist[N];
void bfs(int s){
    q.push(s);
    viz[s]=1;
    dist[s]=0;
    int x;
    while(!q.empty()){
        x=q.front();
        for(auto i:v[x]){
            if(viz[i]==0){
                q.push(i);
                viz[i]=1;
                dist[i]=dist[x]+1;
            }
        }
        q.pop();
    }
}
int main(){
    int a,b,s;
    fin>>n>>m>>s;
    int c=0;
    for(int i=0;i<n;i++)
        dist[i]=-1;

for(int i=0;i<m;i++)
    {
        fin>>a>>b;
        v[a].push_back(b);
    }
    bfs(s);
    for(int i=1;i<=n;i++)
        fout<<dist[i]<<" ";
return 0;
}