#include "islands.h" #include <variant> #include <vector> #include<bits/stdc++.h> using namespace std; #define F first #define S second #define all(x) x.begin(),x.end() typedef long long ll; #define pb push_back #define INF 9999999999999999 variant<bool, vector<int> > find_journey(int N, int M, vector<int> U, vector<int> V) { return false; }