View Compilation Error

0_0_39027537_24424.cpp: In function 'int main()':
0_0_39027537_24424.cpp:15:32: error: invalid conversion from 'long long int' to 'void*' [-fpermissive]
   15 |                         memset(a,0,sizeof(a));
      |                                ^
      |                                |
      |                                long long int
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/cstring:42,
                 from .\stdc++.h:121:
gcc-13.1.0/x86_64-w64-mingw32/include/string.h:53:31: note:   initializing argument 1 of 'void* memset(void*, int, size_t)'
   53 |   void * __cdecl memset(void *_Dst,int _Val,size_t _Size);
      |                         ~~~~~~^~~~
0_0_39027537_24424.cpp:22:34: error: invalid types 'long long int[long long int]' for array subscript
   22 |                                 a[x]++;
      |                                  ^
0_0_39027537_24424.cpp:26:43: error: invalid types 'long long int[long long int]' for array subscript
   26 |                                 sum+=pre*a[i];
      |                                           ^
0_0_39027537_24424.cpp:27:39: error: invalid types 'long long int[long long int]' for array subscript
   27 |                                 pre+=a[i];
      |                                       ^