Cod sursa(job #2855339)

Utilizator Goia_DariusGoia Darius Goia_Darius Data 22 februarie 2022 12:40:51
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.77 kb
#include <fstream>
#include <vector>
#include <queue>
#include <bitset>

using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector <int>v[100001];
queue<int>q;
int viz[100001];
int n,m,i,j;
void BFS(int start)
{
    viz[start]=1;
    q.push(start);
    while(!q.empty())
    {
        int k=q.front();
        q.pop();
        for(vector<int>::iterator it=v[k].begin();it<v[k].end();it++)
        {
            if(!viz[*it])
            {
                q.push(*it);
                viz[*it]=viz[k]+1;
            }
        }
    }
    for(int i=1;i<=n;i++)
        g<<viz[i]-1<<" ";
}
int main()
{
    int st;
    f>>n>>m>>st;
    for(int o=1;o<=m;o++)
    {
        f>>i>>j;
        v[i].push_back(j);
    }
    BFS(st);
}