Russian Doll Envelopes 描述 You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope can fit into another if and only if both the width and height of on
题目链接 A. Nicholas and Permutation(Codeforces 676A) 思路 显然,将最大值或最小值中的一个交换到数组的某一端(若不放在端点上,则放在更靠近端点的位置总能得到更优的解)能让最大值与最小值之间的距离最大。我们可以通过计算计算出最优的方法。但是因为只有四种组合(最小值最左,最小值最右,最大值最左,最大值最右),所以可以直接枚举组合,并更新最优解。
354.Which command is used to begin a tablespace point-in-time recovery? A. Restore tablespace B. Recover tablespace C. Tablespace recover D. Recover to time E. recover datafile Answer: B 答案解