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这是数学公式.....

Posted by i_love_c at 2007-02-21 11:04:01 on Problem 2000
a=n*(n-1)/2+1;
1                1$
2  3             2$
4  5  6          3$
7  8  9  10      4$
11 12 13 14 15   5$
...

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