原创 ImportError: Python is not installed as a framework
ImportError: Python is not installed as a framework. The Mac OS X backend will not be able to function correctly i
2020-04-20 11:37:02
原创 python import導入模塊
regular imports 常規導入 use from to import relative imports 相對導入 optional imports 可選導入 local imports 本地導入 import con
2020-04-20 11:37:02
原创 03.使用私有構造方法或者枚舉類型實現單例Singleton屬性【Effective Java】
Character 2 Creating and Destroying objects 使用私有構造方法或者枚舉類型執行單例singleton屬性 文章目錄問題場景方法一：公共屬性 public field方法二：靜態工廠方法方法
2020-04-06 14:39:43
原创 樹的子結構[劍指offer]之python實現
題目描述 輸入兩棵二叉樹A，B，判斷B是不是A的子結構。（ps：我們約定空樹不是任意一個樹的子結構） 題目鏈接 # -*- coding:utf-8 -*- # class TreeNode: # def __init__
2020-02-20 22:51:55
原创 Leetcode Matchsticks to Square 473
Remember the story of Little Match Girl? By now, you know exactly what matchsticks the little match girl has, pleas
2020-02-20 22:51:44
原创 Leetcode Number of Segments in a String 434
Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space chara
2020-02-20 22:51:44
原创 Leetcode Add Strings 415
Given two non-negative numbers num1 and num2 represented as string, return the sum of num1 and num2. Note: The leng
2020-02-20 22:51:44
原创 Leetcode Number of Boomerangs 447
Given n points in the plane that are all pairwise distinct, a “boomerang” is a tuple of points (i, j, k) such that
2020-02-20 22:51:44
原创 Leetcode Counting Bits 338
Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’s i
2020-02-20 22:51:43
原创 Leetcode Best Time to Buy and Sell Stock
dp練習： 1. Input: [7, 1, 5, 3, 6, 4] Output: 5 max. difference = 6-1 = 5 (not 7-1 = 6, as selling price needs to be
2020-02-20 22:51:43
原创 Leetcode Total Hamming Distance 477
The Hamming distance between two integers is the number of positions at which the corresponding bits are different.
2020-02-20 22:51:43
原创 Leetcode Decode Ways 91
A message containing letters from A-Z is being encoded to numbers using the following mapping: ‘A’ -> 1 ‘B’ -> 2
2020-02-20 22:51:43
原创 Leetcode Longest Substring Without Repeating Characters 3
Given a string, find the length of the longest substring without repeating characters. Examples: Given “abcabcbb”,
2020-02-20 22:51:43
原创 Leetcode Reverse Words in a String 151
Given an input string, reverse the string word by word. For example, Given s = “the sky is blue”, return “blue is
2020-02-20 22:51:43
原创 Leetcode Binary Watch 401
A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the m
2020-02-20 22:51:43