Problems Description
输入N,打印相应图案
Input格式
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">一行:整数N(0<N<=20)</span>
Output格式
<span style="color:#336699;font-family:'Times New Roman';font-size:18px;line-height:28px;background-color:#BBD8E9;">N行,每items数占四items字符位</span>
Sample
Sample Input 1
5
Sample Output 1
1 2 6 7 15
3 5 8 14
4 9 13
10 12
11
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