Cod sursa(job #2567124)

Utilizator spartanul300Vasile Andrei spartanul300 Data 3 martie 2020 15:17:26
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.78 kb
#include <bits/stdc++.h>

using namespace std;

ifstream f("bfs.in");
ofstream g("bfs.out");

vector <int> v[100100];
queue <int> q;
int viz[100100];

void BFS(int nod_start)
{
    q.push(nod_start);
    viz[nod_start]=0;
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();

        for(int i=0;i<v[nod].size();i++)
        {
            int vecin=v[nod][i];
            if(viz[vecin]==-1)
            {
                viz[vecin]=viz[nod]+1;
                q.push(vecin);
            }
        }
    }
}

int n,m,S,i,x,y;
int main()
{
    f>>n>>m>>S;
    for(i=1;i<=m;i++)
    {
        f>>x>>y;
        v[x].push_back(y);
    }

    for(i=1;i<=n;i++)viz[i]=-1;
    BFS(S);
    for(i=1;i<=n;i++)g<<viz[i]<<" ";
    return 0;
}