View Compilation Error

0_0_25729599_8853.cpp: In function 'void update(int, int, int, int, int, int)':
0_0_25729599_8853.cpp:120:16: error: 'struct Tree' has no member named 'sum'
         tr[rt].sum=max(v,tr[rt].sum);
                ^
0_0_25729599_8853.cpp:120:33: error: 'struct Tree' has no member named 'sum'
         tr[rt].sum=max(v,tr[rt].sum);
                                 ^