Cod sursa(job #3001212)

Utilizator MorarCezarMorar Cezar MorarCezar Data 13 martie 2023 13:01:05
Problema BFS - Parcurgere in latime Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.8 kb
#include <bits/stdc++.h>

using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
int n,m,start;
int viz[100005],d[100005];
vector<int>G[100005];
void citire()
{
    f>>n>>m>>start;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        f>>x>>y;
        G[x].push_back(y);
    }

}
void bfs(int start)
{
    queue<int>q;
    q.push(start);
    d[start]=0;
    while(!q.empty())
    {
        int x=q.front();
        q.pop();
        if(viz[x]==1)continue;
        viz[x]=1;
        for(auto i:G[x]){
            if(!viz[i])
                q.push(i),d[i]=d[x]+1;
        }
    }
    for(int i=1;i<=n;i++)
        if(d[i]==0 && i!=start)
            g<<"-1 ";
        else
        g<<d[i]<<" ";

}
int main()
{
    citire();
    bfs(start);
    return 0;
}