Cod sursa(job #3285996)

Utilizator adimiclaus15Miclaus Adrian Stefan adimiclaus15 Data 13 martie 2025 17:29:37
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.19 kb
#include <bits/stdc++.h>

using namespace std;

const int NMAX = 1e5;
const int INF = 1e9;
vector<int> G[NMAX + 1];
int d[NMAX + 1], vis[NMAX + 1];
int n, m, s;

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

void bfs(int sursa)
{
    
    for(int i=1;i<=n;i++)
    {
        d[i]=INF;
    }
    d[sursa]=0;
    vis[sursa]=1;
    queue<int> q;
    q.push(sursa);
    while(!q.empty())
    {
        int node=q.front();
        q.pop();
        for(int i=0;i<G[node].size();i++)
        {
            int next=G[node][i];
            if(vis[next]==0&&d[next]>d[node]+1)
            {
                vis[next]=1;
                d[next] = d[node]+1;
                q.push(next);
            }
        }
    }
}


int main() {
    
    f >> n >> m >> s;
    while(m--) {
        int a, b;
        f >> a >> b;
        G[a].push_back(b);
        //G[b].push_back(a);
    }
    // int nr = 0;
    // for(int i = 1; i <= n; i++) {
    //     if(vis[i] == 0) {
    //         nr++;
    //         dfs(i);
    //     }
    // }
    // g << nr;
    bfs(s);
    for(int i = 1; i <= n; i++) {
        if(d[i] == INF) {
            g << -1 << ' ';
        } else {
            g << d[i] << ' ';
        }
    }
    return 0;
}