#include "keys.h"
#include<bits/stdc++.h>
#define vi vector<int>
#define f0r(i,n) for(int i = 0; i<n; i++)
#define mp make_pair
#define pb push_back
#define FOR(i, k, n) for(int i = k; i<n; i++)
#define pii pair<int,int>
#define dout(x) cout<<x<<' '<<#x<<'\n';
#define vout(x) for(auto u : x)cout<<u<<' '; cout<<'\n';
#define vvi vector<vi>
using namespace std;
std::vector<int> find_reachable(std::vector<int> r, std::vector<int> u, std::vector<int> v, std::vector<int> c) {
int n = r.size();
vi ans(n);
long long sum = accumulate(ans.begin(), ans.end(), 0LL);
if(sum == 0){
f0r(i,n)ans[i] = 1;
return ans;
}
else{
f0r(i,n)if(r[i] != 0)ans[i] = 1;
return ans;
}
return ans;
}
