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### 100. Same Tree

Given two binary trees, write a function to check if they are the same or not.Two binary trees are considered the same if they are structurally identical and the nodes have the……

### 88. Merge Sorted Array

Given two sorted integer arrays nums1 and nums2, merge nums2 into nums1as one sorted array.Note:The number of elements initialized in nums1 and nums2 are m and nrespectively.Yo……

### 83. Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once.Example 1:Input: 1->1->2Output: 1->2Example 2:Input: 1->1->2->……

### 67. Add Binary

Given two binary strings, return their sum (also a binary string).The input strings are both non-empty and contains only characters 1 or 0.Example 1:Input: a = "11", b = "1"……

### 58. Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.If the last word does not exist, return 0……

### 53. Maximum Subarray

Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and return its sum.Example:Input: [-2,1,-3,4,-1,2,1,-5,4],……

### 38. Count and Say

The count-and-say sequence is the sequence of integers with the first five terms as following:1. 12. 113. 214. 12115. 1112211 is read off as "one……

### 35. Search Insert Position(Easy)

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.You may assume no du……

### 28. Implement strStr()

Implement strStr().Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.Example 1:Input: haystack = "hello", needle = "ll"……

### 26. Remove Duplicates from Sorted Array

Given a sorted array nums, remove the duplicates in-place such that each element appear only once and return the new length.Do not allocate extra space for another array, you m……

### 21. Merge Two Sorted Lists

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-……

### 20. Valid Parentheses

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 ……

### 14. Longest Common Prefix

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 "".Example 1:Input: ["flower","flow"……

### six兼容库

tensorflow 最近开源了 TF-RANKING，看代码的时候发现反复使用了 six 库，说实话一直在用 python3，基本上没有考虑过兼容性的问题，顺便学习一下，需要学习的东西还很多，加油吧！本文转载而来。SIX 是用于 python2 与 python3 兼容的库。它存在的目的是为了拥有无需修改即可在 Python 2 和 Python ……

### Xgbfi特征重要性分析(xgboost扩展)

Xgbfi用于训练好的 xgboost 模型分析对应特征的重要性，当然你也可以使用 fmap 来观察What is Xgbfi?Xgbfi is a XGBoost model dump parser, which ranks features as well as feature interactions by different metrics.……

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