foo.cc: In function 'int main()':
foo.cc:73:11: warning: 'ans' may be used uninitialized [-Wmaybe-uninitialized]
   73 |     printf("-1\n%d",ans);
      |     ~~~~~~^~~~~~~~~~~~~~
foo.cc:44:21: note: 'ans' was declared here
   44 |     int m,l=0,r,mid,ans;
      |                     ^~~

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