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1001-1100/1049.md

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例如有几个数`a,b,c,d,e`,根据题目意思,两个石头互相减去重量,即其中2种分法为(假设都保证是大数减小数):
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`(a-b)-(c-d)-e` ===>`a-b-c+d-e`===>`(a+d)-(b+c+e)`
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`((a-b)-c)-(d-e)` ===>`a-b-c-d+e`===>`(a+e)-(b+c+d)`
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可以看出,最后的结果相当于用一部分数字的和减去另一部分数字的和,也就是分成两堆的差。

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