Pagini recente » Cod sursa (job #2122998) | Cod sursa (job #216525) | Cod sursa (job #2920151) | Cod sursa (job #2611459) | Cod sursa (job #1909452)
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#define N 100001
using namespace std;
vector<int> g[N];
int n;
void citire(int &src)
{
int m;
ifstream fin("bfs.in");
fin >> n >> m >> src;
for(int i=1; i<=m; i++)
{
int x,y;
fin >> x >> y;
g[x].push_back(y);
}
fin.close();
}
void bfs(int src)
{
int visited[N];
for(int i=1; i<=n; i++)
visited[i] = -1;
visited[src] = 0;
queue<int> q;
q.push(src);
while(!q.empty())
{
int x = q.front();
q.pop();
vector<int>::iterator i;
for(i = g[x].begin(); i!=g[x].end(); ++i)
if(visited[*i]==-1)
{
visited[*i] = visited[x]+1;
q.push(*i);
}
}
ofstream fout("bfs.out");
for(int i=1; i<=n; i++)
fout << visited[i] << " ";
fout.close();
}
int main()
{
int src;
citire(src);
bfs(src);
return 0;
}