这是小川的第387次更新,第416篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第248题(顺位题号是1037).回旋镖是一组各不相同且不在一条直线上的三个点.给出三个点的列表,判断这些点是否是回旋镖. 例如: 输入:[[1,1],[2,3],[3,2]] 输出:true 输入:[[1,1],[2,2],[3,3]] 输出:false 注意: points.length == 3 points[i].length == 2 0 <= points[i][j] <=…

problem 1037. Valid Boomerang 参考 1. Leetcode_easy_1037. Valid Boomerang; 完…

题目标签:Math 题目给了我们三个点,让我们判断这三个点是否在一条直线上. 利用斜率 k = (y1 - y0) / (x1 - x0) 来判断,如果 三个点 abc, ab 的斜率 = bc 的斜率,那么这三个点在一条直线上.因为分母位置上 可能会出现0, 所以把除法转换成乘法.具体看code. Java Solution: Runtime:  0 ms, faster than 100 % Memory Usage: 34 MB, less than 100 % 完成日期:07/31/20…

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 中学数学题 日期 题目地址:https://leetcode.com/problems/valid-boomerang/ 题目描述 A boomerang is a set of 3 points that are all distinct and not in a straight line. Given a list of three point…

题目如下: A boomerang is a set of 3 points that are all distinct and not in a straight line. Given a list of three points in the plane, return whether these points are a boomerang. Example 1: Input: [[1,1],[2,3],[3,2]] Output: true Example 2: Input: [[1,…

Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tuple matters). Find the number of boomerangs.…

题目:Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the longest valid parentheses substring is "()", which has length = 2. Another example i…

20. 有效的括号 20. Valid Parentheses 题目描述 给定一个只包括 '(',')','{','}','[',']' 的字符串,判断字符串是否有效. 有效字符串需满足: 左括号必须用相同类型的右括号闭合. 左括号必须以正确的顺序闭合. 注意空字符串可被认为是有效字符串. LeetCode20. Valid Parentheses 示例 1: 输入: "()" 输出: true 示例 2: 输入: "()[]{}" 输出: true 示例 3: 输…

Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the longest valid parentheses substring is "()", which has length = 2. Another example is &…

三星机试也考了类似的题目,只不过是要针对给出的数独修改其中三个错误数字,总过10个测试用例只过了3个与世界500强无缘了 36. Valid Sudoku Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially filled, where empty cells are filled with the character '.'. A…