View Compilation Error

0_0_30095900_1041.cpp: In function 'void insert(int)':
0_0_30095900_1041.cpp:27:7: error: 'tri' was not declared in this scope
   if(!tri
       ^
0_0_30095900_1041.cpp:27:7: error: expected ')' at end of input
0_0_30095900_1041.cpp:27:7: error: expected statement at end of input
0_0_30095900_1041.cpp:27:7: error: expected '}' at end of input
0_0_30095900_1041.cpp:27:7: error: expected '}' at end of input