摘要:
构建树状数组,实则就是初始化C数组。对于C数组,我们知道,下标为i的Ci,在树形逻辑结构中,它的父亲是i + 2^k = y,而它父亲的父亲则是y + 2^ k' = m...一直到超出数据范围为止。也就是说,原本的Ai,只会影响Ci及Ci的祖先。 由此,我们定义一个add(x,v)函数,使得它可以 阅读全文
摘要:
Suppose you have N integers from 1 to N. We define a beautiful arrangement as an array that is constructed by these N numbers successfully if one of t 阅读全文