Pagini recente » Cod sursa (job #1204356) | Cod sursa (job #1484342) | Cod sursa (job #788296) | Cod sursa (job #959780) | Cod sursa (job #2160565)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
const int MaxN = 100005;
int N, M, S;
vector<int> G[MaxN];
queue<int> Q;
int d[MaxN];
void Read();
void BFS(int x);
int main()
{
Read();
for(int i = 1; i <= N; ++i)
d[i] = -1;
BFS(S);
for(int i = 1; i <= N; ++i)
fout << d[i] << " ";
fout << '\n';
fout.close();
return 0;
}
void Read()
{
fin >> N >> M >> S;
while(M--)
{
int x, y;
fin >> x >> y;
G[x].push_back(y);
}
fin.close();
}
void BFS(int x)
{
d[x] = 0;
Q.push(x);
while(!Q.empty())
{
int new_x = Q.front();
Q.pop();
for(const int y : G[new_x])
if(d[y] == -1)
d[y] += d[new_x] + 2, Q.push(y);
}
}