/in/foo.cc: In function 'int main()':
/in/foo.cc:78:7: warning: 'ma' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(ma<0||mi>0)
     ~~^~
/in/foo.cc:78:13: warning: 'mi' may be used uninitialized in this function [-Wmaybe-uninitialized]
  if(ma<0||mi>0)
           ~~^~
/in/foo.cc:97:8: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%d",ans);
  ~~~~~~^~~~~~~~~~