View Compilation Error

0_0_30808980_21548.cpp: In function 'int query(int)':
0_0_30808980_21548.cpp:36:14: error: expected primary-expression before '%' token
         idx -%
              ^
0_0_30808980_21548.cpp:36:14: error: expected primary-expression at end of input
0_0_30808980_21548.cpp:36:14: error: expected '}' at end of input
0_0_30808980_21548.cpp:36:14: error: expected '}' at end of input