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Cod sursa(job #632687)
#include <cstdio>
#include <queue>
#include <vector>
#define MAX_N 100010
using namespace std;
vector <int> ad[MAX_N];
int dist[MAX_N], n, m, s;
void read() {
int x, y;
scanf("%d%d%d", &n, &m, &s);
for(int i = 0; i < m; i ++) {
scanf("%d%d", &x, &y);
ad[x].push_back(y);
}
}
void solve() {
queue <int> q;
int x;
for(int i = 1; i <= n; i ++)
dist[i] = -1;
q.push(s);
dist[s] = 0;
while(!q.empty()) {
x = q.front();
for(int i = 0; i < ad[x].size(); i ++)
if(dist[ad[x][i]] == -1) {
q.push(ad[x][i]);
dist[ad[x][i]] = dist[x] + 1;
}
q.pop();
}
}
void write() {
for(int i = 1; i <= n; i ++)
printf("%d ", dist[i]);
printf("\n");
}
int main() {
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
read();
solve();
write();
return 0;
}