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所有乱序和的大小排序有规律吗?
无吧 888888
切比雪夫不等式 凑8个字
倾向于这问题是NP难的,假设aia_iai一半+1一半-1,xix_ixi非负,bi=(−1)ixi/2b_i=(-1)^ix_{i/2}bi=(−1)ixi/2,这个排序问题包含了以下子问题:给x_i赋上符号使得x_i和为零?
居然能发出公式,超越hollow了