One day , Wang and Dong in the Dubai desertexpedition, discovered an ancient castle. Fortunately, they found a map of thecastle.The map marks the location of treasures.<o:p></o:p>
They agreed to distribute the treasures according to the following rules:<o:p></o:p>
Wang draws a horizontal line on the map and then Dong draws a vertical one so that the map is divided into 4 parts, as show below.
Wang will save the treasures in I and III ,while those situated in II and IV will betaken away by Dong. Wangfirst draw a horizontal line, Dong after the draw a vertical line. <o:p></o:p>
They drewseveral pairs of lines. For each pair, Wangwants to know the difference between their treasures.<o:p></o:p>
It's guaranteed that all the reasures will lie on neither of the linesdrew by them.<o:p></o:p>