View Compilation Error

0_0_39034081_8038.cpp: In function 'int dfs(ll)':
0_0_39034081_8038.cpp:15:23: error: 'solve' was not declared in this scope
   15 |     return (se[n]=min(solve(n/2)+n%2,dfs(n/3)+n%3)+1);
      |                       ^~~~~