Pagini recente » Cod sursa (job #2981599) | Cod sursa (job #2755688) | Cod sursa (job #1581944) | Cod sursa (job #2758619) | Cod sursa (job #1650135)
#include <fstream>
#include <vector>
#include <queue>
#include <bitset>
using namespace std;
ifstream in("bfs.in");
ofstream out("bfs.out");
const int NMAX = 100001;
vector<int> muchii[NMAX];
int n,m,s;
int way[NMAX];
queue<int> coada;
bitset<NMAX> mark;
void citire()
{
in>>n>>m>>s;
int x,y;
for(int i=1;i<=m;i++)
{
in>>x>>y;
muchii[x].push_back(y);
}
in.close();
}
void bfs()
{
for(int i=1;i<=n;i++)
way[i] = -1;
way[s] = 0;
coada.push(s);
mark.set(s);
int y;
while(!coada.empty())
{
y = coada.front();
for(unsigned int i = 0;i<muchii[y].size();i++)
if(!mark.test(muchii[y][i]))
{
coada.push(muchii[y][i]);
mark.set(muchii[y][i]);
way[muchii[y][i]] = way[y]+1;
}
coada.pop();
}
}
int main()
{
citire();
bfs();
for(int i=1;i<=n;i++)
out<<way[i]<<" ";
out.close();
return 0;
}