View Compilation Error

0_0_17528760_363.cpp: In function 'long long int run(long long int)':
0_0_17528760_363.cpp:176:13: error: expected '}' before 'else'
             else tree->set(op1, -op2);
             ^
0_0_17528760_363.cpp: At global scope:
0_0_17528760_363.cpp:180:5: error: expected unqualified-id before 'delete'
     delete tree; delete oper;
     ^
0_0_17528760_363.cpp:180:18: error: expected unqualified-id before 'delete'
     delete tree; delete oper;
                  ^
0_0_17528760_363.cpp:181:1: error: expected declaration before '}' token
 }
 ^