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Cod sursa(job #796178)
#include <cstdio>
#include <vector>
#include <queue>
#define N 100005
using namespace std;
queue <int> Q;
vector <int> graph[N];
int start;
int n,m;
int viz[N];
int paths[N];
void citire()
{
scanf("%d %d %d",&n,&m,&start);
for(int i = 0 ; i < m; i++)
{
int x,y;
scanf("%d %d",&x,&y);
graph[x].push_back(y);
}
}
void bfs(int start)
{
for(int i = 0 ; i < N;i++)
paths[i] = -1;
paths[start] =0;
viz[start] = 1;
Q.push(start);
while(!Q.empty())
{
int front= Q.front();
for(int j = 0 ; j < graph[front].size();j++)
{
if(!viz[graph[front][j]])
{
viz[graph[front][j]] = 1;
paths[graph[front][j]] = paths[front]+1;
Q.push(graph[front][j]);
}
}
Q.pop();
}
}
void afis()
{
for(int i = 1; i<=n;i++)
{
printf("%d ",paths[i]);
}
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
citire();
bfs(start);
afis();
return 0;
}