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Cod sursa(job #997794)
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <queue>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <fstream>
using namespace std;
const string file = "bfs";
const string infile = file + ".in";
const string outfile = file + ".out";
const int INF = 0x3f3f3f3f;
vector<vector<int> > G;
vector<bool> uz;
int N, M, S;
vector<int> dist;
void bfs(int s)
{
dist[s] = 0;
queue<int> q;
q.push(s);
uz[s] = true;
while(q.empty() == false)
{
int c = q.front();
q.pop();
for(vector<int>::iterator itr = G[c].begin();
itr != G[c].end();
itr++)
{
if(uz[*itr] == false)
{
uz[*itr] = true;
dist[*itr] = dist[c] + 1;
q.push(*itr);
}
}
}
}
int main()
{
fstream fin(infile.c_str(), ios::in);
fin >> N >> M >> S;
G.resize(N + 1);
uz.resize(N + 1);
dist.resize(N + 1, -1);
for(int i = 0; i < M; i++)
{
int x, y;
fin >> x >> y;
G[x].push_back(y);
}
fin.close();
bfs(S);
fstream fout(outfile.c_str(), ios::out);
for(int i = 1; i <= N; i++)
{
fout << dist[i] << " ";
}
fout << "\n";
fout.close();
}