Cod sursa(job #2530594)

Utilizator valispartanuStefan Valentin Popescu valispartanu Data 24 ianuarie 2020 23:05:57
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.77 kb
#include <bits/stdc++.h>

using namespace std;

vector <int> g[100005];
int n,m,s;
//bool viz[100005]= {false};
int d[100005]= {-1};
ifstream f ("bfs.in");
ofstream o ("bfs.out");

/*struct edge
{
    int a,b;
}
edge e;*/

void BFS()
{
    memset(d, -1, sizeof(d));
    d[s]=0;
    queue<int> q;
    q.push(s);
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(int i=0; i<g[nod].size(); i++)
        {
            if(d[g[nod][i]]==-1)
            {
                d[g[nod][i]]=d[nod]+1;
                q.push(g[nod][i]);
            }
        }
    }
}
int main()
{
    int x,y;
    f>>n>>m>>s;
    for(int i=1; i<=m; i++)
    {
        f>>x>>y;
        g[x].push_back(y);
    }

    BFS();
    for(int i=1;i<=n;i++)
        o<<d[i]<<" ";
    return 0;
}