/in/foo.cc: In function 'int main()':
/in/foo.cc:94:8: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d",ans);
  ~~~~~~^~~~~~~~~~
/in/foo.cc:89:18: warning: 'maxa' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(check(mid=(l+r)>>1))
                ~~^~~
/in/foo.cc:81:7: warning: 'ma' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(ma<0||mi>0)
     ~~^~
/in/foo.cc:81:13: warning: 'mi' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(ma<0||mi>0)
           ~~^~