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Cod sursa(job #590429)
#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;
void bfs(std::vector<std::pair<int, 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.size(); i++)
{
std::pair<int, int> p = adj[i];
if (p.first == node)
{
if (visited.find(p.second) == visited.end())
{
q.push(p.second);
visited[p.second] = visited[p.first] + 1;
}
}
}
}
}
int main()
{
int m, n, s, i;
std::vector<std::pair<int, int> > adj;
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.push_back(std::pair<int, int>(x, 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;
}