Cod sursa(job #2839919)

Utilizator Maria-BorcaBorca Maria Maria-Borca Data 26 ianuarie 2022 18:51:52
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.36 kb
#include <bits/stdc++.h>

#define MAXN 100005

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

vector<int> v[MAXN];
int n, m, mat[105][105], s;
bool vizitat[MAXN];
int dist[MAXN];
queue<int> q;

void citire() {
    int x, y;
    fin >> n >> m >> s;
    for (int i = 1; i <= m; i++) {
        fin >> x >> y;
        v[x].push_back(y);
    }
}

void afisare() {
    for (int i = 1; i <= n; i++) {
        cout << i << ": ";
        for (auto e : v[i])
            cout << e << ' ';
        cout << endl;
    }
}

void dfs(int nod) {
    vizitat[nod] = true;
    for (auto e : v[nod])
        if (!vizitat[e])
            dfs(e);
}

void bfs(int start) {
    vizitat[start] = true;
    q.push(start);
    while (!q.empty()) {
        int nod = q.front();
        q.pop();
        for (auto e : v[nod])
            if (!vizitat[e]) {
                vizitat[e] = true;
                q.push(e);
                dist[e] = dist[nod] + 1;
            }
    }

}

void dfsMat(int nod) {
    vizitat[nod] = true;
    for (int j = 1; j <= n; j++) {
        if (mat[nod][j] == 1 && !vizitat[j])
            dfsMat(j);
    }
}


int main() {
    citire();
    bfs(s);
    for (int i = 1; i <= n; i ++)
        if (!vizitat[i])
            fout << -1 << ' ';
        else fout << dist[i] << ' ';
    return 0;
}