Cod sursa(job #3213695)

Utilizator PalcPalcu Stefan Palc Data 13 martie 2024 12:55:11
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.82 kb
#include <bits/stdc++.h>
#define MOD 1999999973
using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

int n, m, S;
int d[100005];
vector<int> a[100005];
queue<int> q;

void BFS(int x)
{
    for (int i = 1; i <= n; i++)
        d[i] = 2e9;
    d[x] = 0;
    q.push(x);
    while (!q.empty())
    {
        x = q.front();
        q.pop();
        for (int e : a[x])
            if (d[e] > d[x] + 1)
            {
                d[e] = d[x] + 1;
                q.push(e);
            }
    }
}

int main()
{
    int x, y;
    fin >> n >> m >> S;
    for (int i = 1; i <= m; i++)
    {
        fin >> x >> y;
        a[x].push_back(y);
    }
    BFS(S);
    for (int i = 1; i <= n; i++)
        if (d[i] != 2e9) fout << d[i] << " ";
        else fout << "-1 ";
    fout << "\n";
}