View Compilation Error

0_0_39455964_30212.cpp: In function 'void solve()':
0_0_39455964_30212.cpp:128:26: error: no match for call to '(std::vector<long long int>) ()'
  128 |     vector<ll> ANS =f.tag();
      |                     ~~~~~^~
0_0_39455964_30212.cpp:131:18: error: 'i' was not declared in this scope
  131 |         res^=ANS[i];
      |                  ^