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Cod sursa(job #839458)
#include<fstream>
#include<vector>
#include<queue>
#define INF 10000000
#define NMAX 100009
using namespace std;
ifstream f("bfs.in"); ofstream g("bfs.out");
int n, m, t, nod_a, nod_b, viz[NMAX];
struct nod
{
int v;
int c;
nod(){};
nod(int a, int b)
{
v = a;
c = b;
};
};
queue<int>q;
vector<nod> x[NMAX];
inline void citire();
inline void bfs(int);
int main()
{
citire();
bfs(t);
for(int i = 1; i <= n; ++i)
if(viz[i] != INF)
g<<viz[i]<<' ';
else
g<<-1<<' ';
g.close();
return 0;
}
inline void citire()
{
f>>n>>m>>t;
for(int i = 1; i <= m; ++i)
{
f>>nod_a>>nod_b;
x[nod_a].push_back(nod(nod_b, 1));
if(i <= n) viz[i] = INF;
}
f.close();
}
inline void bfs(int k)
{
q.push(k);
viz[k] = 0;
while(!q.empty())
{
k = q.front(); q.pop();
vector<nod>::iterator it;
for(it = x[k].begin(); it != x[k].end(); ++it)
if((*it).c + viz[k] < viz[(*it).v])
{
viz[(*it).v] = (*it).c + viz[k];
q.push((*it).v);
}
}
}