HDU 6680 Rikka with Quicksort(数学推导&分段打表)

HDU 6680 Rikka with Quicksort(数学推导&分段打表) 题目大意 给出一个函数 g m ( i ) = 0 0 ≤ i ≤ m g m ( i ) = i − 1 + 1 i ∑ j = 1 i ( g m ( j ) + g m ( i − j ) ) i > m \begin{aligned} &g_m(i)=0&0\le i\le m\\ &a

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