foo.cc: In function 'int solve_aux_3()':
foo.cc:149:8: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
  149 | return ans;
      |        ^~~
foo.cc:91:5: note: 'ans' was declared here
   91 | int ans;
      |     ^~~
foo.cc: In function 'int solve_aux_2()':
foo.cc:212:8: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
  212 | return ans;
      |        ^~~
foo.cc:154:5: note: 'ans' was declared here
  154 | int ans;
      |     ^~~

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