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Cod sursa(job #613578)
#include<cstdio>
#include<vector>
#include<queue>
#define NMAX 100100
using namespace std;
vector<int> L[NMAX];
int cst[NMAX];
queue<int> Q;
int main()
{
int N,M,start,i,now,x,y;
vector<int> :: iterator it;
freopen("bfs.in","r",stdin);
freopen("bfs.out","w",stdout);
scanf("%d%d%d",&N,&M,&start);
for(i=1;i<=M;i++)
{
scanf("%d%d",&x,&y);
L[x].push_back(y);
}
for(i=1;i<=N;i++)
cst[i] = -1;
cst[start]=0; Q.push(start);
while(!Q.empty())
{
now = Q.front();
for(it = L[now].begin() ; it != L[now].end(); it ++)
if (cst[*it] == -1)
{
cst[*it] = cst[now] + 1;
Q.push(*it);
}
Q.pop();
}
for(i=1;i<=N;i++)
printf("%d ",cst[i]);
return 0;
}