View Compilation Error

0_0_39628257_22313.cpp: In function 'int main()':
0_0_39628257_22313.cpp:19:9: error: conflicting declaration 'std::set<long long int> st'
   19 | set<int>st;
      |         ^~
0_0_39628257_22313.cpp:18:28: note: previous declaration as 'std::map<long long int, std::set<std::pair<long long int, long long int> > > st'
   18 | map<int,set<pair<int,int>>>st,mpp;
      |                            ^~
0_0_39628257_22313.cpp:125:14: error: 'vt' was not declared in this scope; did you mean 'st'?
  125 |              vt.insert(fst);
      |              ^~
      |              st
0_0_39628257_22313.cpp:134:12: error: 'vt' was not declared in this scope; did you mean 'st'?
  134 |            vt.insert(fst);
      |            ^~
      |            st
0_0_39628257_22313.cpp:137:16: error: 'vt' was not declared in this scope; did you mean 'st'?
  137 |     for(auto x:vt)
      |                ^~
      |                st