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…

#include<stdio.h> int main() { int i, l; ]; ]; l = ; ) { l++; } ; a[i]!= && i<l; i++) printf(]); printf("End of Output\n"); ; }…

2900: F-A Simple Question 时间限制: 1 Sec  内存限制: 128 MB 提交: 66  解决: 24 题目描述 今天,pasher打算在一个浪漫的花园和他的搭档们聚餐,但是不幸的是,pasher忘记了花园的地点,他只记得这个花园看上去像个平行于坐标轴的正方形,他还记得花园的每个顶点上都有一棵大数.现在,pasher知道其中两棵树的坐标,且这两棵树在对角线上,你能帮他找出另外两棵树的坐标吗? 输入 多组输入,直到文件末.每组输入包含一行,第一行包含四个整数,x1,y…

A Simple Tree Problem Time Limit: 3 Seconds      Memory Limit: 65536 KB Given a rooted tree, each node has a boolean (0 or 1) labeled on it. Initially, all the labels are 0. We define this kind of operation: given a subtree, negate all its labels. An…

Very Simple Counting Time Limit: 1 Second      Memory Limit: 32768 KB Let f(n) be the number of factors of integer n. Your task is to count the number of i(1 <= i < n) that makes f(i) = f(n). Input One n per line (1 < n <= 1000000). There are…

Solution: 根据树的遍历道的时间给树的节点编号,记录下进入节点和退出节点的时间.这个时间区间覆盖了这个节点的所有子树,可以当做连续的区间利用线段树进行操作. /* 线段树 */ #pragma comment(linker, "/STACK:102400000,102400000") #include <iostream> #include <cstdio> #include <cstring> #include <cmath>…

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…

Description Given a rooted tree, each node has a boolean (0 or 1) labeled on it. Initially, all the labels are 0. We define this kind of operation: given a subtree, negate all its labels. And we want to query the numbers of 1's of a subtree. Input Mu…

题解:素数筛+唯一分解定理 可以把素数筛那部分放到while之外,减小时间复杂度. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdbool.h> #include <assert.h> const int maxn = 110000005; const int mod = 100000007; const int N = 60000008; int…

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…