# -*- 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…

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…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 回溯法 日期 题目地址:https://leetcode.com/problems/n-queens/ 题目描述 The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other.…

# -*- 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 -*-'''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…

一天一道LeetCode系列 (一)题目 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 integer n, return all distinct solutions to the n-queens puzzle. Each solution contains a distinct bo…

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…