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Cod sursa(job #949851)
#include<cstdio>
#include<queue>
#include<vector>
using namespace std;
#define NMAX 1000005
queue <int> q;
vector <int> G[NMAX];
int n,m,s,x,y,Nr[NMAX/10+5];
void citire()
{
int i;
scanf("%d%d%d",&n,&m,&s);
for (i=1;i<=m;++i)
scanf("%d%d",&x,&y), G[x].push_back(y);
}
void bfs(int S)
{
int i;
q.push(S);
Nr[S]=1;
while (!q.empty())
{
x=q.front(); q.pop();
for (i=0;i<G[x].size();++i)
{
y=G[x][i];
if (!Nr[y] || Nr[y]>Nr[x]+1)
{
q.push(y);
Nr[y]=Nr[x]+1;
}
}
}
}
int main()
{
int i;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
citire();
bfs(s);
for (i=1;i<=n;++i)
printf("%d ",Nr[i]-1);
printf("\n");
return 0;
}