#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define sp <<" "<<
#define endl "\n"
variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
vector<vector<pair<int, int>>> adj(N), rev(N);
for (int i = 0; i < M; i++) {
adj[U[i]].emplace_back(V[i], i);
rev[V[i]].emplace_back(U[i], i);
}
assert(N == 2);
int a, b, c;
vector<int> ans;
if (adj[0].size() >= 2 and adj[1].size() >= 1) {
a = adj[0][0].second;
b = adj[0][1].second;
c = adj[1][0].second;
ans = {a, c, b, a, c, b};
} else {
return false;
}
return ans;
}
