Archive 2015 May-14th SRM 659 Div1 PublicTransitHard 函數式線段樹可持久化樹形dp 2014 Nov-9th UVa 11669 - Non Decreasing Prime Sequence sieve函數式線段樹可持久化 Aug-30th b278. 说话不算话的区间求和 函數式線段樹 Aug-30th a331. K-th Number 函數式線段樹可持久化