/in/foo.cc: In function 'void dts::main()':
/in/foo.cc:127:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
      if (xv<a[x].Y&&a[y].Y<yv||x==y)
          ~~~~~~~~~^~~~~~~~~~~
/in/foo.cc: In function 'int dts::search(int, int)':
/in/foo.cc:104:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^