Main.cc: In function ‘int main()’:
Main.cc:17:12: warning: format ‘%lld’ expects argument of type ‘long long int*’, but argument 2 has type ‘int*’ [-Wformat=]
   17 |  scanf("%lld" , &n ) ;
      |         ~~~^    ~~
      |            |    |
      |            |    int*
      |            long long int*
      |         %d
Main.cc: In function ‘void merge_sort(ll, ll)’:
Main.cc:61:8: error: ‘h’ was not declared in this scope
   61 |    a[l+h] = temp[t] ;
      |        ^