https://www.hackerrank.com/contests/w5/challenges/closest-number 简单题. #include <iostream> #include <cmath> using namespace std; int main() { int T; cin >> T; while (T--) { int a, b, x; cin >> a >> b >> x; if (b < 0 &…

Given a target number and an integer array A sorted in ascending order, find the index i in A such that A[i] is closest to the given target. Return -1 if there is no element in the array. 分析 使用binary Search 找到可以插入 target 的 position, 例如是 i, 那么,从i(包括i)…

Given a target number, a non-negative integer k and an integer array A sorted in ascending order, find the k closest numbers to target in A, sorted in ascending order by the difference between the number and target. Otherwise, sorted in ascending ord…

@"0.01" 转换成float时, 经常会变成  0.009999799 这种形式, 因为float类型无法精准保存, 系统会选一个接近的值来代替. 而double类型则可以有更好的精度. http://stackoverflow.com/questions/9328260/converting-nsstring-to-float-adds-in-decimal-places Your issue seems to be that you don't understand how f…

1 - 从strStr谈面试技巧与代码风格 必做题: 13.字符串查找 要求:如题 思路:(自写AC)双重循环,内循环读完则成功 还可以用Rabin,KMP算法等 public int strStr(String source, String target) { if (source == null || target == null) { return -1; } char[] sources = source.toCharArray(); char[] targets = target.to…

BigDecimal _0_1 = new BigDecimal(0.1); BigDecimal x = _0_1; for(int i = 1; i <= 10; i ++) { System.out.println(i+" x 0.1 is "+x+", as double "+x.doubleValue()); x = x.add(_0_1); } 输出: 0.1000000000000000055511151231257827021181583404…

1)正态分布数据,飘出95%的可能是异常值.变量var正态标准化,|var|<=1.96的可能是异常值,further chk needed!large sample better. 对于偏态分布的数据(histogram chk),这个方法貌似不是很好. 2)Boxplot Method 稳健,无正态分布假设. 箱线图判断异常值的标准以四分位数和四分位距为基础. 四分位距(QR, Quartile range):上四分位数与下四分位数之间的间距,即上四分位数减去下四分位数. F代表中位数,QR…

Java Algorithm Problems 程序员的一天 从开始这个Github已经有将近两年时间, 很高兴这个repo可以帮到有需要的人. 我一直认为, 知识本身是无价的, 因此每逢闲暇, 我就会来维护这个repo, 给刷题的朋友们一些我的想法和见解. 下面来简单介绍一下这个repo: README.md: 所有所做过的题目 ReviewPage.md: 所有题目的总结和归纳(不断完善中) KnowledgeHash2.md: 对所做过的知识点的一些笔记 SystemDesign.md:…

1.  Container With Most Water Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Find two lines, which togethe…

Sorting is often useful as the first step in many different tasks. The most common task is to make finding things easier, but there are other uses also. Challenge Given a list of unsorted numbers, can you find the numbers that have the smallest absol…