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Cod sursa(job #590430)
#include <stdio.h>
#include <vector>
#include <utility>
#include <queue>
#include <map>
#define WHITE 1
#define GRAY 2
#define BLACK 3
std::map<int, int> visited;
std::vector<int> adj[100001];
void bfs(std::vector<int> *adj, int s)
{
std::queue<int> q;
q.push(s);
visited[s] = 0;
while (!q.empty())
{
int node = q.front();
q.pop();
for (int i = 0; i < adj[node].size(); i++)
{
int child = adj[node][i];
if (visited.find(child) == visited.end())
{
q.push(child);
visited[child] = visited[node] + 1;
}
}
}
}
int main()
{
int m, n, s, i;
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
scanf("%d %d %d", &n, &m, &s);
for (i = 0; i < m; i++)
{
int x, y;
scanf("%d %d", &x, &y);
adj[x].push_back(y);
}
bfs(adj, s);
for (i = 1; i <= n; i++)
{
if (visited.find(i) != visited.end())
printf("%d ", visited[i]);
else
printf("-1 ");
}
return 0;
}