Pagini recente » Cod sursa (job #971037) | Cod sursa (job #2689033) | Cod sursa (job #130936) | Cod sursa (job #3158129) | Cod sursa (job #2860831)
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#define NMax 100005
using namespace std;
ifstream fin ("bfs.in");
ofstream fout ("bfs.out");
int N, S, Distanta[NMax];
vector <int> vec[NMax];
void BFS(int nodStart)
{
queue <int> Coada;
Coada.push(nodStart);
Distanta[nodStart] = 1;
while( !Coada.empty() )
{
int nodCurent = Coada.front();
Coada.pop();
for(unsigned int i = 0; i < vec[nodCurent].size(); ++ i)
if(Distanta[vec[nodCurent][i]] == 0)
{
Distanta[vec[nodCurent][i]] = Distanta[nodCurent] + 1;
Coada.push(vec[nodCurent][i]);
}
}
}
int main()
{
int M, x, y;
fin >> N >> M >> S;
for(int i = 1; i <= M; ++ i)
{
fin >> x >> y;
vec[x].push_back(y);
}
BFS(S);
for(int i = 1; i <= N; ++ i)
{
if(Distanta[i] != 0)
fout << Distanta[i] - 1 << ' ';
else fout << -1 << ' ';
}
return 0;
}