Problems Description
<p class="p0" style="text-indent:21.0000pt;"> 计算<span>a </span>– b<span>。</span> </p>
Input格式
<p class="p0" style="text-indent:21.0000pt;"> 输入数据的Page 一行是一items整数<span>T</span><span>，表示有</span><span>T</span><span>组测试样例，接着是</span><span>T</span><span>行数据，每行两items整数</span><span>a</span><span>和</span><span>b</span><span>，</span><span>-100<a,b<100</span><span>。</span> </p>
Output格式
<p class="p0" style="text-indent:21.0000pt;"> 对于每组测试样例，输出<span>a </span>– b<span>的值并独占一行。</span> </p>
Sample
Sample Input 1
3
2 1
99 99
-3 5
Sample Output 1
1
0
-8
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