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Hunan Normal University
College of Information Science and Engineering
简单的题2015
Time Limit: 1000ms, Special Time Limit:2500ms, Memory Limit:32768KB
Total submit users: 81, Accepted users: 69
Problem 11618 : No special judgement
Problem description
  每一届的师兄师姐都会碰到一道简单的题,2015级也不例外。输入2个32位整数,输出其差。

Input
  输入有若干行,每行2个整数,用一个空格分割。0 0表示输入结束,且该行不需要再计算了。

Output
  每行一个数,表示对应输入的差。

Sample Input
2 1
0 0
Sample Output
1
Problem Source
  HUNNU Contest 

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