View Compilation Error

0_0_35710182_29006.cpp: In function 'void update(int, int)':
0_0_35710182_29006.cpp:12:4: error: invalid conversion from 'int (*)(int)' to 'int' [-fpermissive]
   x+=lowbit;
    ^
0_0_35710182_29006.cpp: In function 'int main()':
0_0_35710182_29006.cpp:28:30: error: expected ';' before ')' token
   memset(tree,0,sizeof(tree)));
                              ^