/in/foo.cc: In function 'int main()':
/in/foo.cc:8:14: error: array must be initialized with a brace-enclosed initializer
   int n,a[b]=0;
              ^
/in/foo.cc:14:21: error: 'i' was not declared in this scope
  sort(a[0],sizeof(a[i]))
                     ^
/in/foo.cc:15:17: error: 'j' was not declared in this scope
     for(int j=0;j<n;j++)
                 ^