View Compilation Error

0_0_39468957_12074.cpp:13:1: error: expected unqualified-id before '=' token
   13 | =
      | ^
0_0_39468957_12074.cpp: In function 'void solve()':
0_0_39468957_12074.cpp:44:19: error: 'dfs' was not declared in this scope
   44 |         int ans = dfs(1, 0);
      |                   ^~~