View Compilation Error

0_0_33602171_32257.cpp: In function 'int main()':
0_0_33602171_32257.cpp:87:15: error: 'struct Segment_Tree' has no member named 'Build'
             T.Build(1, 1, m1);
               ^
0_0_33602171_32257.cpp:91:23: error: 'struct Segment_Tree' has no member named 'Update'
                     T.Update(1, 1, m1, p[x].x, p[x].w);
                       ^