foo.cc: In function 'int un(int*, int, int*)':
foo.cc:15:13: warning: unused variable 'i' [-Wunused-variable]
   15 |         int i=0,k=0;
      |             ^
foo.cc:20:1: warning: no return statement in function returning non-void [-Wreturn-type]
   20 | }
      | ^
foo.cc: In function 'int main()':
foo.cc:33:9: error: 'l' was not declared in this scope
   33 |         l=un(a,n,h);
      |         ^

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