#include "train.h"
#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define INF 10000000
#define MOD 1000000007
#define MID ((l+r)/2)
#define HASHMOD 2305843009213693951
#define ll long long
#define ull unsigned long long
#define F first
#define S second
typedef pair<ll, ll> ii;
typedef pair<ii, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef map<int, int> mii;
#define EPS 1e-6
#define FOR(i,n) for(int i=0;i<((int)(n));i++)
#define FORi(i,a,b) for(int i=((int)(a));i<((int)(b));i++)
#define FOA(v, a) for(auto &v : a)
#define len(x) ((int)x.size())
vector<vi> adj;
vector<vi> rev;
vi vis;
vi r;
void dfs(int s){
vis[s] = 1;
for(auto v : adj[s]){
if(!vis[v]) dfs(v);
}
vis[s] = 2;
}
vi who_wins(vi a, vi rr, vi u, vi v) {
r = rr;
int n = len(a);
adj.assign(n, vi());
rev.assign(n, vi());
vis.assign(n,0);
vi res(n, 0);
FOR(i, len(u)){
adj[u[i]].push_back(v[i]);
rev[v[i]].push_back(u[i]);
}
set<int> loop;
FOR(i,n){
if(r[i]==0) continue;
vis.assign(n,0);
dfs(i);
FOA(v,rev[i]) if(vis[v] && r[i]) loop.insert(i);
}
queue<int> q;
vi used(n, 0);
FOA(v,loop) q.push(v), used[v] = true;
while(!q.empty()){
int t = q.front();
q.pop();
res[t] = 1;
FOA(v,rev[t]){
if(!used[v]){
used[v] = true;
q.push(v);
}
}
}
return res;
}
