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原创 Leetcode#21 Merge Two Sorted Lists-Easy

Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists. Example: Input: 1->2->4, 1->3->4 Output: 1-...

2019-08-05 21:18:22 130

原创 Leetcode#20 Valid Parentheses -Easy

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: Open brackets must be closed by the same type of b...

2019-08-01 22:15:40 137

原创 LeetCode#19-Medium

Given a linked list, remove then-th node from the end of list and return its head. Example: Given linked list: 1->2->3->4->5, and n = 2. After removing the second node from the end, t...

2019-07-30 18:01:56 122

原创 LeetCode#18 4Sum-Medium

Given an arraynumsofnintegers and an integertarget, are there elementsa,b,c, anddinnumssuch thata+b+c+d=target? Find all unique quadruplets in the array which gives the sum oftar...

2019-07-26 15:45:37 133

原创 Leetcode#17. Letter Combinations of a Phone Number-Medium

Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is giv...

2019-07-19 21:32:39 191

原创 Leetcode#16. 3Sum Closest_-Medium

Given an arraynumsofnintegers and an integertarget, find three integers innumssuch that the sum is closest totarget. Return the sum of the three integers. You may assume that each input would ...

2019-07-18 13:20:57 119

原创 Leetcode #15. 3Sum -Medium

Given an arraynumsofnintegers, are there elementsa,b,cinnumssuch thata+b+c= 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not conta...

2019-07-17 18:55:34 98

原创 LeetCode #14. Longest Common Prefix-Easy

要求： Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return an empty string "". 解题思路：要一位一位的比较，python中有一个zip()，可以实现一位一位比较 zip()介...

2019-07-08 22:54:14 126

原创 LeetCode #13. Roman to Integer-Easy

罗马数字转为普通数字表示，其中需要注意的是特殊数字的表示方法，比如和4,9相关的表示方法，因为都是非单个字符表示，如果遍历转换会出现麻烦 speciallist——特殊的罗马数字列表 valuedic——罗马数字与普通数字对应关系的字典步骤：1.排查是是否有speciallist中的内容，有就记录下位置，通过valuedic得出对应的数字 2.将speciallis...

2019-07-02 13:42:30 173

原创 LeetCode#12. Integer to Roman-Medium

罗马数字表示的数字，每一位都可以分开进行处理，所以将个位，十位，百位，千位可能的表示方法用list单独列出（因为这个题目有提示范围是在1-3999） class Solution(object): def intToRoman(self, num): """ :type num: int :rtype: str """ ...

2019-07-02 13:24:44 158

原创 C# DataGridView实现分页显示功能

以上是效果图最近项目需要实现分页显示功能，自己写了一个用户控件进行记录一下，demo功能比较简单，数据来源主要以test手动添加为主思路： 1.分页显示——将要显示的内容按照一次显示的大小建立DataTable DataTable dt = new DataTable(tableName); 对于Table中如果有很多列需要建立，单独一个个手动添加会比较麻烦，可以选择建立一个...

2019-01-06 17:44:08 15478 3

原创个人机器学习路线图

理论部分机器学习 1.《机器学习》周志华 2. Machine Learning 吴恩达课程数学高等数字同济版徐小湛《高等数学》视频线性代数同济版同济大学公开课线性代数概率论浙大版浙江大学公开课概率论与数理统计《统计学学习方法》李航实战部分 1. 100-Days-Of-ML-Code https://github.com/Avik-Ja...

2018-08-29 09:16:17 760