View Compilation Error

0_0_28849277_11681.cpp:86:17: error: expected '}' at end of input
    if ( idx[i] %3
                 ^
0_0_28849277_11681.cpp: In member function 'int MST::build_tree()':
0_0_28849277_11681.cpp:86:17: error: expected ')' at end of input
0_0_28849277_11681.cpp:86:17: error: expected statement at end of input
0_0_28849277_11681.cpp:86:17: error: expected '}' at end of input
0_0_28849277_11681.cpp: At global scope:
0_0_28849277_11681.cpp:86:17: error: expected unqualified-id at end of input