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例子
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对于n=3，-1、-1、-1,1,1的20种不同排列导致7个能级（符号反向距离之和）：
{0,0,0,1,1,1},{1,1,1,0,0,0}: 13/10
{0,0,1,0,1,1},{1,1,0,1,0,0}: -41/30
{0,0,1,1,0,1},{0,1,0,0,1,1},{1,0,1,1,0,0},{1,1,0,0,1,0}: -56/30
{0,0,1,1,1,0},{0,1,1,1,0,0},{1,0,0,0,1,1},{1,1,0,0,0,1}: -8/10
{0,1,0,1,0,1},{1,0,1,0,1,0}: -37/10
{0,1,0,1,0}、{0,1,1,0,1,0}、{1,0,0,1,0,1}、{1,0,1,0,1}、{1,0,1,0,1}：-89/30
{0,1,1,0,0,1},{1,0,0,1,1,0}: -71/30
所以重数是4*2+3*4=20=二项式（6,3）。
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