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Cod sursa(job #728877)
#include <vector>
#include <queue>
#include <cstdio>
#define N 100001
using namespace std;
vector<int> graph[N];
bool visited[N];
int dist[N];
int n;
void bfs(int start) {
queue<int> q;
q.push(start);
visited[start] = true;
dist[start] = 0;
while (q.size() > 0) {
int current = q.front();
//printf("Scot din coada %d\n", current);
q.pop();
for (vector<int>::iterator it = graph[current].begin();
it != graph[current].end();
it++) {
if (!visited[*it]) {
q.push(*it);
visited[*it] = true;
dist[*it] = dist[current] + 1;
}
}
}
}
int main() {
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
int m, start;
scanf("%d %d %d ", &n, &m, &start);
for (int i = 0; i < n; i++) {
visited[i] = false;
dist[i] = -1;
}
for (int i = 0; i < m; i++) {
int x, y;
scanf("%d %d ", &x, &y);
graph[x - 1].push_back(y - 1);
}
bfs(start - 1);
for (int i = 0; i < n; i++) {
printf("%d ", dist[i]);
}
printf("\n");
return 0;
}