Cod sursa(job #2563491)

Utilizator furfur233Fur Fur furfur233 Data 1 martie 2020 12:03:06
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.68 kb
#include <bits/stdc++.h>

using namespace std;

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

int n,m,s,x,y;
vector<int> g[100005];
int vizitat[100005];
void citire(){
	fin>>n>>m>>s;
	for(int i=0; i<m; i++){
		fin>>x>>y;
		g[x].push_back(y);
	}
	for(int i=1; i<=100005; i++){
		vizitat[i]=-1;
	}
}
queue<int> q;
int el, ngh;
void bfs(int s){
	vizitat[s]=0;
	q.push(s);
	while(!q.empty()){
		el=q.front();
		q.pop();
		for(int i=0; i<g[el].size(); i++){
			ngh=g[el][i];
			if(vizitat[ngh]==-1){
				vizitat[ngh]=vizitat[el]+1;
				q.push(ngh);
			}
		}
	}
}
int main(){
	citire();
	bfs(s);
	for(int i=1; i<=n; i++){
		fout<<vizitat[i]<<" ";
	}
}