Cod sursa(job #2196542)

Utilizator ana_maria.calinescuCalinescu Ana-Maria ana_maria.calinescu Data 19 aprilie 2018 18:16:31
Problema BFS - Parcurgere in latime Scor 20
Compilator cpp Status done
Runda Arhiva educationala Marime 1.07 kb
#include <fstream>
#include <vector>
#include <algorithm>
#include <queue>
#include <iostream>
using namespace std;


const int kNmax = 100005;

int main(){
    int n;
	int m;
    int x,y;
	int source;
	vector<int> adj[kNmax];
    ifstream fin("bfs.in");
		fin >> n >> m >> source;
		for (int i = 1; i <= m; i++) {
			fin >> x >> y;
			adj[x].push_back(y);
		}
	fin.close();
    vector<int> d(n + 1);
    bool *visited = new bool[kNmax];
    for(int i = 1; i <= n; i++) {
        visited[i] = false;
    }
    queue<int> q;
    d[source] = 0;
    for(int i = 1; i <= n; i++) {
        d[i] = -1;
    }
    //visited[source] = true;
    q.push(source);
    d[source] = 0;

    while(!q.empty()) {
        int node = q.front();
        visited[node] = true;
        q.pop();
        for(int i = 0; i < adj[node].size(); i++) {
            if(visited[adj[node][i]] == false) {
                d[adj[node][i]] = d[node] + 1;
                q.push(adj[node][i]);
            }
        }
    }
    ofstream fout("bfs.out");
    for(int i = 1; i<=n ;i++){
        fout<<d[i]<<" ";
    }
    fout.close();
}