原创 187. Repeated DNA Sequences(重複的DNA序列)
187. Repeated DNA Sequences(重複的DNA序列) 1 問題描述 All DNA is composed of a series of nucleotides abbreviated as A, C, G, a
原创 3. Longest Substring Without Repeating Characters(無重複字符的最長子串)
3. Longest Substring Without Repeating Characters(無重複字符的最長子串) 1 問題描述 Given a string, find the length of the longest s
原创 49.Group Anagrams同字符詞語分組
49.Group Anagrams同字符詞語分組 1 描述 Given an array of strings, group anagrams together. Example: Input: ["eat", "tea", "tan
原创 290. Word Pattern(詞語匹配)
290. Word Pattern(詞語匹配) 1 問題描述 Given a pattern and a string str, find if str follows the same pattern.Here follow mea
原创 207. Course Schedule(課程安排)
207. Course Schedule(課程安排) 1 問題描述 There are a total of n courses you have to take, labeled from 0 to n-1.Some courses
原创 199. Binary Tree Right Side View(側面觀察二叉樹)
199. Binary Tree Right Side View(側面觀察二叉樹) 1 問題描述 Given a binary tree, imagine yourself standing on the right side of
原创 114. Flatten Binary Tree to Linked List(二叉樹轉鏈表)
114. Flatten Binary Tree to Linked List(二叉樹轉鏈表) 1.問題描述 Given a binary tree, flatten it to a linked list in-place. 給定一
原创 236.Lowest Common Ancestor of a Binary Tree(最近公共祖先)
236. Lowest Common Ancestor of a Binary Tree(最近公共祖先) 1 問題描述 Given a binary tree, find the lowest common ancestor (LCA
原创 409. Longest Palindrome
409. Longest Palindrome 1.問題描述 Given a string which consists of lowercase or uppercase letters, find the length of th
原创 113 Path Sum II(樹的路徑之和爲一個常數)
113. Path Sum II 1 問題描述 Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the g
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原创 linux常用指令
jobs, fg ->查看運行任務切換任務,ctrl+z直接將當前任務切換到後臺運行 find xargs awk -F ‘\t’ ‘{print $2}’ include_adv_sample | more s
原创 pydensecrf安裝出現問題
mac 通過 pip install pydensecrf 安裝出現如下錯誤: pydensecrf/densecrf/include/Eigen/Core:22:10: fatal error: ‘complex’ file not
原创 xgboost目標函數推導過程
一 說明 xgboost是boosting算法的其中一種,該算法思想就是不斷地添加樹,不斷地進行特徵分裂來生長一棵樹,每次添加一個樹,其實是學習一個新函數,去擬合上次預測的殘差。具體的目標函數如下: (1)Obj(t)=∑i=1nl
原创 Linux基本指令
Linux系統注意事項 Linux主要有連個版本:內核版本和發行版本 Linux是嚴格區分大小寫的,這點與windows不同 Linux中一切內容皆文件,所有的內容都以文件的形式保存,包括硬件 Linux不靠擴展名區分文件類型 Linu