#include "train.h"
#include<bits/stdc++.h>
using namespace std;
std::vector<int> who_wins(std::vector<int> a, std::vector<int> r, std::vector<int> u, std::vector<int> v) {
int n = (int)a.size();
int m = (int)u.size();
vector<int>ans(n);
vector<vector<int>>adj(n);
for (int i = 0;i<m;++i){
adj[u[i]].push_back(v[i]);
}
vector<bool>visited(n,0);
vector<int>cnt(n,0);
vector<int>parent(n,-1);
for (int i = 0;i<n;++i){
function<int(int)>dfs = [&](int u){
if (visited[u]){
int x = u;
int got = 0;
while(parent[x]!=u && parent[x]!=-1){
got|=r[x];
x = parent[x];
}
x = parent[x];
if (x == u){
return (got | cnt[u]);
}
return cnt[u];
}
visited[u] = true;
int ans = 0;
for (auto x:adj[u]){
parent[x] = u;
ans|=dfs(x);
}
return cnt[u] = ans;
};
if (visited[i] != -1){
ans[i] = cnt[i];
}
else{
ans[i] = dfs(i);
}
}
return ans;
}
