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Cod sursa(job #735189)
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <queue>
using namespace std;
struct edge
{
long start,end;
};
vector <edge> v;
vector <long> cost(100001);
vector <long> used(100001);
long n,m,st,x,y;
void read_input()
{
scanf("%ld %ld %ld", &n,&m,&st);
for(int i=0;i<m;i++)
{
scanf("%ld %ld", &x,&y);
edge New;
New.start=x;
New.end=y;
v.push_back(New);
}
}
void BFS(long st)
{
used[st]=1;
for(int i=0;i<100001;i++) cost[i]=100000;
cost[st]=0;
queue <int> q;
q.push(st);
while(!q.empty())
{
int old=q.front();
q.pop();
for(int i=0;i<m;i++)
{
if(v[i].start==old)
{
if(used[v[i].end]==0)
{
q.push(v[i].end);
if(cost[v[i].start]+1<cost[v[i].end]) cost[v[i].end]=cost[v[i].start]+1;
}
}
}
}
for(int i=1;i<=n;i++) if(cost[i]==100000) printf("-1 "); else printf("%ld ", cost[i]);
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
read_input();
BFS(st);
return 0;
}