/in/foo.cc: In function 'void init(int*)':
/in/foo.cc:9:21: warning: 'sizeof' on array function parameter 'a' will return size of 'int*' [-Wsizeof-array-argument]
  memset(a,0,sizeof(a));
                     ^
/in/foo.cc:5:17: note: declared here
 void init(int a[])
                 ^
/in/foo.cc:9:19: warning: argument to 'sizeof' in 'void* memset(void*, int, size_t)' call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess]
  memset(a,0,sizeof(a));
                   ^
/in/foo.cc: In function 'void jia(int*)':
/in/foo.cc:26:9: warning: unused variable 'k' [-Wunused-variable]
   int i,k;
         ^