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Cod sursa(job #866637)
#include<iostream>
#include<iostream>
#include<fstream>
#include<cstdio>
#include<cstring>
#include<iomanip>
#include<string>
#include<vector>
#include<queue>
#include<stack>
#include<bitset>
#include<algorithm>
#define INF (1 << 30)
#define pb push_back
#define mkp make_pair
#define pii pair<int, int>
#define ll long long
#define nxt (*it)
#define type int
#define FORi(i,a,b)\
for(int i=a; i<=b; ++i)
#define FORr(g)\
for(vector<type>::reverse_iterator it=g.rbegin(); it!=g.rend(); ++it)
#define FOR(g)\
for(vector<type>::iterator it=g.begin(); it!=g.end(); ++it)
#define infile "bfs.in"
#define outfile "bfs.out"
#define nMax 100005
using namespace std;
vector < int > v[nMax], Dist(nMax, -1);
int N, M, S;
void read(){
ifstream f(infile);
f >> N >> M >> S;
int x, y;
while(M--){
f >> x >> y;
v[x].pb(y);
}
f.close();
}
void BFS(){
queue < int > q;
q.push(S);
Dist[S] = 0;
while(!q.empty()){
int x = q.front();
q.pop();
FOR(v[x])
if(Dist[nxt] == -1){
Dist[nxt] = Dist[x] + 1;
q.push(nxt);
}
}
}
void print(){
ofstream g(outfile);
FORi(i,1,N)
g << Dist[i] << " ";
g.close();
}
int main(){
read();
BFS();
print();
return 0;
}