chiyeung

摘要： class Empty(Exception): pass class Linklist: class _Node: # Nonpublic class for storing a linked node __slots__='_element','_next' def __init__(self,ele,ne): self._element=ele self._... 阅读全文

摘要： On a N * N grid, we place some 1 * 1 * 1 cubes that are axis-aligned with the x, y, and z axes. Each value v = grid[i][j] represents a tower of v cube 阅读全文

摘要： A self-dividing number is a number that is divisible by every digit it contains. For example, 128 is a self-dividing number because 128 % 1 == 0, 128 阅读全文

摘要： Given an array of 2n integers, your task is to group these integers into n pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of 阅读全文

摘要： There are two direction for us to solve this problem. (1) Recursion Recursive step: T[0] conbines with findsubsets(T[1:]) Final step: if len(T)==0: re 阅读全文

摘要： Given a binary matrix A, we want to flip the image horizontally, then invert it, and return the resulting image. To flip an image horizontally means t 阅读全文

摘要： def permutationN(n): a=[None]*n for i in range(n): a[i]=i+1 sum=1 for j in range(n): sum*=(j+1) i=0 for k in range(sum): # If you want to use stack #a[i:i+2]=swapStack(a[i],a[i+1]) ... 阅读全文

摘要： The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two integers x and y, calcul 阅读全文

摘要： In a 2 dimensional array grid, each value grid[i][j] represents the height of a building located there. We are allowed to increase the height of any n 阅读全文

摘要： International Morse Code defines a standard encoding where each letter is mapped to a series of dots and dashes, as follows: "a"maps to ".-", "b" maps 阅读全文