#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
std::variant<bool, std::vector<int>> find_journey(
int N, int M, std::vector<int> U, std::vector<int> V) {
vector<vector<pair<int,int>>> arr(N);
for (int i = 0; i < M; i+=2){
arr[U[i]].push_back({V[i],i});
}
vector<bool> vis(N,false);
vector<pair<int,int>> par(N,{-1,-1});
function<void(int)> dfs = [&](int node)->void{
if (vis[node]) return;
vis[node]=true;
for (auto it : arr[node]){
if (vis[it.first]) continue;
par[it.first]={node,it.second};
dfs(it.first);
}
};
for (auto it : arr[0]){
if (vis[it.first]) continue;
par[it.first]={0,it.second};
dfs(it.first);
if (par[0].first!=-1){
//oha cevap buldum
return vector<int>(1,23);
}
}
return false;
}
