View Compilation Error

0_0_30428768_6875.cpp: In member function 'int Sam::query(int, int, int, int)':
0_0_30428768_6875.cpp:59:18: error: lvalue required as left operand of assignment
   int mid = (l+r)>>=1;
                  ^
0_0_30428768_6875.cpp: In member function 'void Sam::add(int, int)':
0_0_30428768_6875.cpp:92:15: error: invalid types 'int[int]' for array subscript
     link[nq][q];
               ^