#include "islands.h"
#include <bits/stdc++.h>
using namespace std;
variant<bool, vector<int>> find_journey(int N, int M, vector<int> U, vector<int> V) {
if(N == 2){
vector<int> A,B;
for(int i = 0;i < M;i++){
if(U[i] == 0) A.push_back(i);
else B.push_back(i);
}
if(A.size() < 2 || B.size() < 1) return false;
vector<int> ans{A[0],B[0],A[1],A[0],B[0],A[1]};
return ans;
}
vector<vector<int>> id(N,vector<int>(N));
for(int i = 0;i < M;i++) id[U[i]][V[i]] = i;
vector<int> ans{id[0][1],id[1][0],id[0][2],id[2][0],
id[1][0],id[0][1],id[2][0],id[0][2]};
return ans;
}
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