#include "train.h"
//Challenge: Accepted
#include <iostream>
#include <algorithm>
#include <vector>
#include <utility>
#define ll long long
#define maxn 5005
#define pii pair<int, int>
#define ff first
#define ss second
#define io ios_base::sync_with_stdio(0);cin.tie(0);
using namespace std;
vector<int> adj[maxn], rev[maxn];
bool found[maxn], fr[maxn];
bool poss[maxn];
void dfs(int n, bool f[], vector<int> ed[]) {
f[n] = 1;
for (int v:ed[n]) {
if (!f[v]) dfs(v, f, ed);
}
}
std::vector<int> who_wins(std::vector<int> a, std::vector<int> r, std::vector<int> u, std::vector<int> v) {
int n = a.size(), m = u.size();
for (int i = 0;i < m;i++) {
adj[u[i]].push_back(v[i]);
rev[v[i]].push_back(u[i]);
}
for (int i = 0;i < n;i++) {
if (r[i] == 1) {
for (int j = 0;j < n;j++) found[j] = fr[j] = 0;
dfs(i, found, adj), dfs(i, fr, rev);
for (int j = 0;j < n;j++) poss[j] |= found[j] && fr[j];
}
}
vector<int> ret;
for (int i = 0;i < n;i++) {
if (poss[i]) ret.push_back(1);
else ret.push_back(0);
}
return ret;
}
