Cod sursa(job #3234718)

Utilizator maryyMaria Ciutea maryy Data 11 iunie 2024 13:31:29
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 in("bfs.in");
ofstream out("bfs.out");
int n, m, sursa;
const int nmax = 1e6;
vector <int> graph[nmax+1];
int dist[nmax+1];
void bfs(int sursa)
{
    queue <int> q;
    q.push(sursa);
    dist[sursa] = 1;
    while(!q.empty())
    {
        int nod = q.front();
        q.pop();
        for(auto i:graph[nod])
        {
            if(dist[i] == 0)
            {
                dist[i] = dist[nod] + 1;
                q.push(i);
            }
        }
    }
}
int main()
{
    int x, y;
    in>>n>>m>>sursa;
    for(int i = 1; i <= m; i++)
    {
        in>>x>>y;
        graph[x].push_back(y);
    }
    bfs(sursa);
    for(int i = 1; i <= n; i++)
    {
        out<<dist[i] - 1<<" ";
    }
}