#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
using vi = vector<int>;
int n, m;
vi x, y;
variant<bool, vi> find_journey(int N, int M, vi U, vi V) {
n = N; m = M;
x = U; y = V;
if (n <= 2) return false;
int ab, ba, ac, ca, bc, cb;
for (int i = 0; i < m; i++) {
int u = x[i], v = y[i];
if (u == 0 && v == 1) ab = i;
else if (u == 1 && v == 0) ba = i;
else if (u == 0 && v == 2) ac = i;
else if (u == 2 && v == 0) ca = i;
else if (u == 1 && v == 2) bc = i;
else if (u == 2 && v == 1) cb = i;
}
return vi({ab, bc, ca, ac, cb, ba, ca, bc, ab, ba, cb, ac});
}
