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Cod sursa(job #356262)
#include <stdio.h>
#include <vector>
#include <queue>
#define N 1<<17
using namespace std;
int n,m,s,cost[N];
vector <int> v[N];
void read()
{
scanf("%d%d%d",&n,&m,&s);
int i,x,y;
for (i=1; i<=n; i++)
cost[i]=N;
for (i=1; i<=m; i++)
{
scanf("%d%d",&x,&y);
v[x].push_back(y);
}
}
void solve()
{
queue <int> Q;
cost[s]=0;
Q.push(s);
int i,x;
while (!Q.empty())
{
x=Q.front();
Q.pop();
for (i=0; i<v[x].size(); i++)
{
if (cost[x]+1<cost[v[x][i]])
{
cost[v[x][i]]=cost[x]+1;
Q.push(v[x][i]);
}
}
}
}
void show()
{
int i;
for (i=1; i<=n; i++)
printf("%d ",cost[i]==N ? -1 : cost[i]);
}
int main()
{
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
read();
solve();
show();
return 0;
}