View Compilation Error

0_0_39407547_29146.cpp: In function 'void get_extend()':
0_0_39407547_29146.cpp:14:5: error: 'get_next' was not declared in this scope
   14 |     get_next();
      |     ^~~~~~~~
0_0_39407547_29146.cpp:20:12: error: 'next0' was not declared in this scope
   20 |         if(next0[i-po]+i<extend[po]+po) extend[i]=next0[i-po];
      |            ^~~~~