##002 Input: (2 -> 4 -> 3) + (5 -> 6 -> 4) Output: 7 -> 0 -> 8# 链表节点都是一位数字,以上可以视为243+564=807#先定义节点和链表类import numpy as npimport time class Node(object):    def __init__(self,n,next_node=None):        self.data=n        self.next=next_node…

leetcode python solution 1. two sum (easy) Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution. Example: Given nums = [2, 7, 11, 15],…

目录 LeetCode Python实现算法简介 0001 两数之和 0002 两数相加 0003 无重复字符的最长子串 0004 寻找两个有序数组的中位数 0005 最长回文子串 0006 Z字型变换 0011 盛最多水的容器 0015 三数之和 0016 最接近的三数之和 0026 删除排序数组中的重复项 0027 移除元素 0031 下一个排列 0033 搜索旋转排序数组 0034 在排序数组中查找元素的第一个和最后一个位置 0035 搜索插入位置 0039 组合总和 0040 组合总和I…

# -*- coding: utf8 -*-'''https://oj.leetcode.com/problems/container-with-most-water/ Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai).n vertical lines are drawn such that the two endpoints of line i i…

Python 位操作: 按位与 &, 按位或 | 体会不到 按位异或 ^ num ^ num = 0 左移 << num << 1 == num * 2**1 右移 >> num >> 2 == num / 2**2 取反 ~ ~num == -(num + 1) 1. Single Number Given an array of integers, every element appears twice except for one. Find…

#-*- coding: UTF-8 -*- #既然不能使用加法和减法,那么就用位操作.下面以计算5+4的例子说明如何用位操作实现加法:#1. 用二进制表示两个加数,a=5=0101,b=4=0100:#2. 用and(&)操作得到所有位上的进位carry=0100;#3. 用xor(^)操作找到a和b不同的位,赋值给a,a=0001:#4. 将进位carry左移一位,赋值给b,b=1000:#5. 循环直到进位carry为0,此时得到a=1001,即最后的sum.#!!!!!!关于负数的运算.…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 56: Merge Intervalshttps://oj.leetcode.com/problems/merge-intervals/ Given a collection of intervals, merge all overlapping intervals. For example,Given [1,3],[2,6],[8,10],[15,18],return [1…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 55: Jump Gamehttps://leetcode.com/problems/jump-game/ Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represe…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 54: Spiral Matrixhttps://leetcode.com/problems/spiral-matrix/ Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.For example,Given the f…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 53: Maximum Subarrayhttps://leetcode.com/problems/maximum-subarray/ Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, give…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 52: N-Queens IIhttps://oj.leetcode.com/problems/n-queens-ii/ Follow up for N-Queens problem.Now, instead outputting board configurations, return the total number of distinct solutions. ===C…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 51: N-Queenshttps://oj.leetcode.com/problems/n-queens/ The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an intege…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 50: Pow(x, n)https://leetcode.com/problems/powx-n/ Implement pow(x, n). === Comments by Dabay===技巧在于用x的平方来让n减半.同时注意n为负数的情况,以及n为奇数的情况.''' class Solution: # @param x, a float # @param n, a in…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 49: Anagramshttps://leetcode.com/problems/anagrams/ Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case. === Comments by Dabay==…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 48: Rotate Imagehttps://leetcode.com/problems/rotate-image/ You are given an n x n 2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Could you do this in-place? ===…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 47: Permutations IIhttps://oj.leetcode.com/problems/permutations-ii/ Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example,[1,1,2…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 46: Permutationshttps://leetcode.com/problems/permutations/ Given a collection of numbers, return all possible permutations.For example,[1,2,3] have the following permutations:[1,2,3], [1,3…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 45: Jump Game IIhttps://oj.leetcode.com/problems/jump-game-ii/ Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the arra…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 44:Wildcard Matchinghttps://oj.leetcode.com/problems/wildcard-matching/ '?' Matches any single character.'*' Matches any sequence of characters (including the empty sequence).The matching s…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 43: Multiply Stringshttps://leetcode.com/problems/multiply-strings/ Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbit…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 41: First Missing Positivehttps://oj.leetcode.com/problems/first-missing-positive/ Given an unsorted integer array, find the first missing positive integer.For example,Given [1,2,0] return…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 42: Trapping Rain Waterhttps://oj.leetcode.com/problems/trapping-rain-water/ Given n non-negative integers representing an elevation map where the width of each bar is 1,compute how much wa…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 40: Combination Sum IIhttps://oj.leetcode.com/problems/combination-sum-ii/ Given a collection of candidate numbers (C) and a target number (T),find all unique combinations in C where the ca…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 39: Combination Sumhttps://oj.leetcode.com/problems/combination-sum/ Given a set of candidate numbers (C) and a target number (T),find all unique combinations in C where the candidate numbe…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 38: Count and Sayhttps://oj.leetcode.com/problems/count-and-say/ The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, ... 1 is read off as "o…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 37: Sudoku Solverhttps://oj.leetcode.com/problems/sudoku-solver/ Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character '.'.You may a…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 36: Valid Sudokuhttps://oj.leetcode.com/problems/valid-sudoku/ Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where emp…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 35: Search Insert Positionhttps://oj.leetcode.com/problems/search-insert-position/ Given a sorted array and a target value, return the index if the target is found.If not, return the index…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 34: Search for a Rangehttps://oj.leetcode.com/problems/search-for-a-range/ Given a sorted array of integers, find the starting and ending position of a given target value.Your algorithm's r…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 33: Search in Rotated Sorted Arrayhttps://oj.leetcode.com/problems/search-in-rotated-sorted-array/ Suppose a sorted array is rotated at some pivot unknown to you beforehand.(i.e., 0 1 2 4 5…