HDU 6680 Rikka with Quicksort(數學推導&分段打表)

HDU 6680 Rikka with Quicksort(數學推導&分段打表) 題目大意 給出一個函數 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

>>阅读原文<<