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Cod sursa(job #348557)
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
using namespace std;
#define fin "bfs.in"
#define fout "bfs.out"
#define NMAX 100010
int N, M, S, dist[NMAX];
vector<int> g[NMAX];
queue<int> q;
int main()
{
int i, a, b;
ifstream f1(fin);
ofstream f2(fout);
f1 >> N >> M >> S;
for ( i = 1; i <= M; ++i )
f1 >> a >> b, g[a].push_back(b);
for ( i = 1; i <= N; ++i )
dist[i] = -1;
dist[S] = 0;
q.push(S);
while ( !q.empty() )
{
a = q.front();
q.pop();
for ( i = 0; i < g[a].size(); ++i )
if ( dist[ g[a][i] ] == -1 )
dist[ g[a][i] ] = dist[a] + 1, q.push(g[a][i]);
}
for ( i = 1; i <= N; ++i )
f2 << dist[i] << " ";
f2 << endl;
return 0;
}