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Cod sursa(job #362800)
#include <stdio.h>
#include <vector>
#include <queue>
using namespace std;
#define N 100000
vector<int> g[N + 1];
int n, m, s;
queue<int> q;
int d[N + 1];
void citeste()
{
int i, x, y;
scanf("%d%d%d", &n, &m, &s);
for(i = 1; i <= m; ++i)
{
scanf("%d%d", &x, &y);
g[x].push_back(y);
}
}
void bfs()
{
int e;
for(int k = 1; k <= n; ++k) d[k] = -1;
d[s] = 0;
q.push(s);
vector<int> :: iterator i;
while(!q.empty())
{
e = q.front();
q.pop();
for(i = g[e].begin(); i != g[e].end(); ++i)
{
if(d[*i] == -1)
{
d[*i] = d[e] + 1;
q.push(*i);
}
}
}
}
void scrie()
{
for(int k = 1; k <= n; ++k) printf("%d ", d[k]);
printf("\n");
}
int main()
{
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
citeste();
bfs();
scrie();
return 0;
}