Yohoc

摘要： 1.监督学习 监督学习（supervised learning）擅长在“给定输入特征”的情况下预测标签。 每个“特征-标签”对都称为一个样本（example）。 整个监督学习过程如图所示。 图 监督学习 1.1回归 回归（regression）是最简单的监督学习任务之一。当标签取任意数值时，我们称之 阅读全文

摘要： The difference between undergraudate and postgraduate? The undergraduate education provides foundational knowledge and skills in a broad discipline. T 阅读全文

摘要： c++中如何判断一个浮点数是否为0？ 判断是否在一个误差范围内: cpp const float eps = 1e-6; if(abs(x) < eps) { // x is nearly zero } 舍入到整数再判断: cpp float x = 0.00001; if(round(x) == 阅读全文

摘要： 题目： In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijin 阅读全文

摘要： 题目： Cutting an integer means to cut a K digits lone integer Z into two integers of (K/2) digits long integers A and B. For example, after cutting Z = 阅读全文

摘要： 题目： There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties: (1) Every node is ei 阅读全文

摘要： 题目： Consider a positive integer N written in standard notation with k+1 digits ai​ as ak​⋯a1​a0​ with 0≤ai​<10 for all i and ak​>0. Then N is palindro 阅读全文

摘要： 题目： For a student taking the online course "Data Structures" on China University MOOC (http://www.icourse163.org/), to be qualified for a certificate, 阅读全文

摘要： 题目： Suppose that all the keys in a binary tree are distinct positive integers. Given the preorder and inorder traversal sequences, you are supposed to 阅读全文

摘要： 题目： After each PAT, the PAT Center will announce the ranking of institutions based on their students' performances. Now you are asked to generate the 阅读全文