Pagini recente » Cod sursa (job #2358968) | Cod sursa (job #312675) | Cod sursa (job #1452325) | Cod sursa (job #1194508) | Cod sursa (job #1849836)
#include <iostream>
#include <vector>
#include <queue>
#include <fstream>
using namespace std;
const int NMAX = 1000001;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int N, M, S;
vector<int> muc[NMAX];
int nod[NMAX];
void BFS()
{
int crt;
queue<int> Q;
Q.push(S);
nod[S] = 0;
while(!Q.empty())
{
crt = Q.back();
Q.pop();
for(int i = 0; i < muc[crt].size(); i++)
{
if(nod[muc[crt][i]] == -1 || nod[crt] + 1 < nod[muc[crt][i]])
{
nod[muc[crt][i]] = nod[crt] + 1;
Q.push(muc[crt][i]);
}
}
}
}
int main()
{
fin >> N >> M >> S;
int x, y;
for(int i = 1; i <= N; ++i)
nod[i] = - 1;
for(int i = 1; i <= M; i++)
{
fin >> x >> y;
muc[x].push_back(y);
}
BFS();
for(int i = 1; i <= N; ++i)
fout << nod[i] << ' ';
return 0;
}