View Compilation Error

0_0_37711858_22290.cpp: In function 'void solve()':
0_0_37711858_22290.cpp:68:20: error: invalid use of 'auto'
         upd(a[i], 1);
                    ^
0_0_37711858_22290.cpp:90:29: error: invalid use of 'auto'
                 upd(a[i], -1);
                             ^
0_0_37711858_22290.cpp:101:28: error: invalid use of 'auto'
                 upd(a[i], 1);
                            ^