Cod sursa(job #3141406)

Utilizator picalexPicioroaga Alexandru picalex Data 13 iulie 2023 21:44:16
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.91 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
const int NLIM = 100005;
int N, M, nodStart;
int distanta[NLIM];

vector<int> Muchii[NLIM];
queue<int> Coada;

void BFS() {
	int nod, vecin;
	while (!Coada.empty()) {
		nod = Coada.front();
		Coada.pop();
		for (unsigned int i = 0; i < Muchii[nod].size(); i++) {
			vecin = Muchii[nod][i];
			if (distanta[vecin] == -1) {
				Coada.push(vecin);
				distanta[vecin] = distanta[nod] + 1;
			}
		}
	}
}

void Citire() {
	fin >> N >> M >> nodStart;
	for (int i = 1; i <= M; i++) {
		int x, y;
		fin >> x >> y;
		Muchii[x].push_back(y);
	}
	for (int i = 1; i <= N; i++)
		distanta[i] = -1;
	distanta[nodStart] = 0;

	Coada.push(nodStart);
	BFS();
	for (int i = 1; i <= N; i++)
		fout << distanta[i] << " ";
}

int main()
{
	Citire();
	return 0;
}