View Compilation Error

0_0_38774993_25748.cpp:7:28: error: expected '}' at end of input
    7 |         int tree, pre, suf; //pre
      |                            ^
0_0_38774993_25748.cpp:6:1: note: to match this '{'
    6 | {
      | ^
0_0_38774993_25748.cpp:7:28: error: expected unqualified-id at end of input
    7 |         int tree, pre, suf; //pre
      |                            ^