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Cod sursa(job #896304)
#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <queue>
#include <cstring>
using namespace std;
long long N, M, S;
vector<pair<int, int> > MAT[100010];
int DMIN[100010];
void solve()
{
bool inQ[100010];
queue<int> Q;
memset(DMIN, 0x3f3f3f3f, sizeof(DMIN));
memset(inQ, false, sizeof(inQ));
DMIN[S] = 0;
Q.push(S);
inQ[S] = true;
while(!Q.empty())
{
int now = Q.front();
Q.pop();
inQ[now] = false;
for(vector<pair<int, int> >::iterator it = MAT[now].begin();it != MAT[now].end();++it)
if(DMIN[now] + it->second < DMIN[it->first])
{
DMIN[it->first] = DMIN[now] + it->second;
if(!inQ[it->first])
{
Q.push(it->first);
inQ[it->first] = true;
}
}
}
}
int main()
{
int i, A, B, C;
freopen("bfs.in", "r", stdin);
freopen("bfs.out", "w", stdout);
cin>>N>>M>>S;
for(i=1;i<=M;++i)
{
scanf("%d %d", &A, &B);
MAT[A].push_back(make_pair(B, 1));
}
solve();
for(i=1;i<=N;++i)
cout<<(DMIN[i] < 0x3f3f3f3f ? DMIN[i] : -1)<<" ";
return 0;
}