View Compilation Error

0_0_36466064_6900.cpp: In member function 'void ZXY::operator&=(ZXY) const':
0_0_36466064_6900.cpp:49:29: error: assignment of member 'ZXY::val' in read-only object
         if(val < t.val) val = t.val , cnt = 0;
                             ^
0_0_36466064_6900.cpp:49:43: error: assignment of member 'ZXY::cnt' in read-only object
         if(val < t.val) val = t.val , cnt = 0;
                                           ^
0_0_36466064_6900.cpp:50:30: error: assignment of member 'ZXY::cnt' in read-only object
         if(val == t.val) cnt += t.cnt;
                              ^