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Cod sursa(job #864844)
#include <cstdio>
#include <cstring>
#include <iostream>
#include <queue>
#include <bitset>
using namespace std;
#define Nmax 100001
struct nod{
int info;
nod *next;
};
nod *Graf[Nmax];
bitset <Nmax> viz;
queue <int> Q;
int dist[Nmax];
int N, M, R;
int a, b;
void citire(){
freopen("bfs.in", "r", stdin);
scanf("%d %d %d", &N, &M, &R);
for(; M; M--){
scanf("%d %d", &a, &b);
nod *c = new nod;
c->info = b;
c->next = Graf[a];
Graf[a] = c;
}
}
void init(){
dist[R] = 0;
Q.push(R);
viz[R] = 1;
}
void bfs(){
while(!Q.empty()){
int current = Q.front();
Q.pop();
nod *p = Graf[current];
nod *c = p;
while(c){
if(!viz[c->info])
dist[c->info] = dist[current] + 1,
viz[c->info] = 1,
Q.push(c->info);
c = c->next;
}
}
for(int i = 1; i <= N; i++)
if(dist[i] == 0 && i != R)
dist[i] = -1;
}
void afis(){
freopen("bfs.out", "w", stdout);
for(int i = 1; i<= N; i++)
printf("%d ", dist[i]);
}
int main(){
citire();
init();
bfs();
afis();
return 0;
}