View Compilation Error

0_0_14262473_11462.cpp: In function 'void getans(int)':
0_0_14262473_11462.cpp:50:81: error: lvalue required as left operand of assignment
         else if(drop[book[tt.x][tt.y]].sizes == 0 || drop[book[tt.x][tt.y]].bro = 1)
                                                                                 ^