View Compilation Error

0_0_28427024_24493.cpp: In function 'void dfs(int, int)':
0_0_28427024_24493.cpp:12:15: error: 'operate' was not declared in this scope
 for(int i=0;i<operate.size();i++)
               ^
0_0_28427024_24493.cpp:13:17: error: expected primary-expression before '<<' token
 cout<<operate{i}<<"";
                 ^
0_0_28427024_24493.cpp:19:1: error: 'operate' was not declared in this scope
 operate.push_back('i');
 ^
0_0_28427024_24493.cpp:28:1: error: 'operate' was not declared in this scope
 operate.push_back('o');
 ^
0_0_28427024_24493.cpp: At global scope:
0_0_28427024_24493.cpp:33:2: error: expected unqualified-id at end of input
 }int 
  ^