#include "islands.h"
#include <variant>
#include <vector>
#include <bits/stdc++.h>
using namespace std;
std::variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
if (N == 2) return false;
map<pair<int, int>, int> mp;
for (int i = 0; i < M; ++i) {
mp[{U[i], V[i]}] = i;
}
vector<int> Path = {0, 1, 2, 0, 2, 1, 0, 1, 2, 0, 2, 1, 0};
vector<int> ret;
for (int i = 0; i < 6; ++i) {
ret.push_back(mp[{Path[i], Path[i + 1]}]);
}
for (int i = 0; i < N; ++i) {
for (int j = i + 1; j < N; ++j) {
swap(mp[{i, j}], mp[{j, i}]);
}
}
for (int i = 6; i < 12; ++i) {
ret.push_back(mp[{Path[i], Path[i + 1]}]);
}
return ret;
}
