View Compilation Error

0_0_14227053_24215.cpp:26:1: error: 'll' does not name a type
 ll ans,flag,L,R;
 ^
0_0_14227053_24215.cpp:27:10: error: variable or field 'dfs' declared void
 void dfs(ll l,ll r)
          ^
0_0_14227053_24215.cpp:27:10: error: 'll' was not declared in this scope
0_0_14227053_24215.cpp:27:15: error: 'll' was not declared in this scope
 void dfs(ll l,ll r)
               ^