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Cod sursa(job #519993)
#include <iostream>
#include <fstream>
#include <queue>
using namespace std;
#define nmax 100001
long n, m, s;
int viz[nmax];
queue <int> C;
struct nod
{
int y;
nod *prev; // previous
}*v[nmax];
void add(nod *&dest, long val)
{
nod *p = new nod;
p -> y = val;
p -> prev = dest;
dest = p;
}
void citire()
{
long x, y;
ifstream in("bfs.in"); in>>n>>m>>s;
for(long i=1; i<=m; i++)
{
in>>x>>y;
add(v[x], y);
}
}
inline void afisare()
{
long i;
ofstream out("bfs.out");
for(long i=1; i<=n; i++)
if(!viz[i])
if(i==s)
out<<0<<" ";
else
out<<-1<<" ";
else
out<<viz[i]-1<<" ";
}
void bfs(int x)
{
C.push(x); nod *p; viz[x] = 1;
while(!C.empty())
{
x = C.front(); C.pop();
for(p=v[x]; p; p=p->prev)
if(!viz[p->y])
{
viz[p->y] = viz[x]+1;
C.push(p->y);
}
}
}
int main()
{
citire();
bfs(s);
afisare();
return 0;
}