View Compilation Error

0_0_38989321_32175.cpp: In function 'void built(long long int, long long int, long long int)':
0_0_38989321_32175.cpp:25:15: error: 'ls' was not declared in this scope; did you mean 'l'?
   25 |         built(ls(t),l,mid);
      |               ^~
      |               l
0_0_38989321_32175.cpp:26:15: error: 'rs' was not declared in this scope; did you mean 'r'?
   26 |         built(rs(t),mid+1,r);
      |               ^~
      |               r