A Simple Question of Chemistry Time Limit: 2 Seconds Memory Limit: 65536 KB Your chemistry lab instructor is a very enthusiastic graduate student who clearly has forgotten what their undergraduate Chemistry 101 lab experience was like. Your inst…
一.你会在时间序列数据集上使用什么交叉验证技术?是用k倍? 答:都不是.对于时间序列问题,k倍可能会很麻烦,因为第4年或第5年的一些模式有可能跟第3年的不同,而我们最终可能只是需要对过去几年的进行验证,这就不能用这种方法了.相反,我们可以采用如下所示的5倍正向链接策略: fold 1 : training [1], test [2] fold 2 : training [1 2], test [3] fold 3 : training [1 2 3], test [4] fold 4 : tra…
F - A Simple Problem with Integers Time Limit:5000MS Memory Limit:131072KB 64bit IO Format:%lld & %llu Description 给出了一个序列,你需要处理如下两种询问. "C a b c"表示给[a, b]区间中的值全部增加c (-10000 ≤ c ≤ 10000). "Q a b" 询问[a, b]区间中所有值的和. Input 第一行包…
Functions in Java Prior to the introduction of Lambda Expressions feature in version 8, Java had long been known as a purely object-oriented programming language. "Everything is an Object" is the philosophy deep in the language design. Objects a…
D - Interval queryTime Limit: 1.5 Sec Memory Limit: 256 MB Description This is a very simple question. There are N intervals in number axis, and M queries just like “QUERY(a,b)” indicate asking the maximum number of the disjoint intervals between (a,…