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全部文章（共226篇）

[note]特殊方法

#!usr/bin/env python #coding=utf-8 from math import hypot class Vector(object): def __init__(self, x, y): self.x = x self.y = y ...

2020-07-14

0 454

[leetcode292]Nim Game

问题描述： You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1...

2020-07-14

0 483

[leetcode151] Reverse Words in a String

问题描述： Given an input string, reverse the string word by word. For example, Given s = “the sky is blue”, return “blue is sky the”. 代码： class Solu...

2020-07-14

0 415

[leetcode190]Reverse Bits

问题描述： Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 00000010100101000001111010011100...

2020-07-14

0 486

[leetcode295]Find Median from Data Stream

问题描述： Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of ...

2020-07-14

0 445

[leetcode297]Serialize and Deserialize Binary Tree

问题描述： Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory ...

2020-07-14

0 442

about dict

the method __missing__ >>>from collections import defaultdict >>>d = defaultdict(list) >>>d['a'].append(1) >>>d['...

2020-07-14

0 431

about hash

about __hash__ hash表是一个稀疏数组或者说是一个总也填不满的数组。在标准的数据结构的课本中，hash表中的一个单元叫bucket.在字典中，每个键值对都拥有一个bucket。在这个bucket中，一部分存储对key(键)的引用，一部分存储对value(值)的引用。由于所有...

2020-07-14

0 515

inspect a function object

use inspect module to figure out the attributes in a function object. there is a clip function below: def clip(text, max_len=80): ""&q...

2020-07-14

0 466

simple cases about functional programming

import functools def fac(n): return functools.reduce(lambda a,b:a*b, range(1,n+1)) fac(5) 120 another solution is using operator module ...

2020-07-14

0 373