#include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> using namespace std; using namespace __gnu_pbds; //change this back typedef int ll; //const ll MOD=1e9+7; int solve(int N,int M,vector<int> F,vector<vector<int>> S){ vector<vector<ll>> adj(n); for(ll i=0;i<=(n-1);i++){ adj[i].push_back(F[i]); adj[F[i]].push_back(i); } return n-1; } /* int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL); //dra } */

september.cpp: In function 'int solve(int, int, std::vector<int>, std::vector<std::vector<int> >)':
september.cpp:9:32: error: 'n' was not declared in this scope
    9 |         vector<vector<ll>> adj(n);
      |                                ^