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Language: Crossing
Description Wintokk has collected a huge amount of coins at THU. One day he had all his coins fallen on to the ground. Unfortunately, WangDong came by and decided to rob Wintokk of the coins. They agreed to distribute the coins according to the following rules: Consider the ground as a plane. Wintokk draws a horizontal line on the plane and then WangDong draws a vertical one so that the plane is divided into 4 parts, as shown below. Wintokk will save the coins in I and III while those fit in II and IV will be taken away by the robber WangDong. For fixed locations of the coins owned by Wintokk, they drew several pairs of lines. For each pair, Wintokk wants to know the difference between the number of the saved coins and that of the lost coins. It's guaranteed that all the coins will lie on neither of the lines drew by that two guys. Input The first line contains an integer ( Output For each query, output a non-negative integer, the difference described above. Output a blank line between cases. Sample Input 2 10 3 29 22 17 14 18 23 3 15 6 28 30 27 4 1 26 7 8 0 11 21 2 25 5 10 19 24 10 5 28 18 2 29 6 5 13 12 20 27 15 26 11 9 23 25 10 0 22 24 16 30 14 3 17 21 8 1 7 4 Sample Output 6 4 4 2 2 4 4 4 Source POJ Monthly--2007.10.06, Wang Dong |

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