View Compilation Error

0_0_26538534_10737.cpp: In function 'void cdq(int, int)':
0_0_26538534_10737.cpp:68:28: error: 'update' was not declared in this scope
             update(a[x].z,1),t[y++]=a[x++];
                            ^
0_0_26538534_10737.cpp:69:33: error: 'get_sum' was not declared in this scope
         a[i].ans+=get_sum(a[i].z);
                                 ^
0_0_26538534_10737.cpp:73:34: error: 'update' was not declared in this scope
     while(--x>=l)update(a[x].z,-1);
                                  ^
0_0_26538534_10737.cpp: In function 'int main()':
0_0_26538534_10737.cpp:83:9: error: 'k' was not declared in this scope
         k=0,memset(a,0,sizeof(a));
         ^