Given a sorted (in ascending order) integer array nums of n elements and a target value, write a function to search target in nums. If target exists, then return its index, otherwise return -1. Example 1: Input: nums = [-1,0,3,5,9,12], target = 9 Out…

LeetCode Binary Search All In One Binary Search 二分查找算法 https://leetcode-cn.com/problems/binary-search/ https://leetcode-cn.com/problems/binary-search/solution/er-fen-cha-zhao-by-leetcode/ 复杂度分析 时间复杂度:\mathcal{O}(\log N)O(logN). 空间复杂度:\mathcal{O}(1)O(…

Binary Search二分查找 作用:二分查找适用于有序的的数组或列表中,如果列表及数组中有n个元素,通过二分查找查询某一元素的位置需要的步骤是log2(n)(注:该log的底数是2) 1.Python实现 def binary_search(list,item): low = 0 high = len(list)-1 #python数组ID从0开始,与matlab不同. t = 0 while low <= high: t = t + 1; mid = round((low + high)…

LeetCode & Binary Search 解题模版 In computer science, binary search, also known as half-interval search, logarithmic search, or binary chop, is a search algorithm that finds the position of a target value within a sorted array. 在计算机科学中,二分搜索(也称为半间隔搜索,对数搜…

二分查找法作为一种常见的查找方法,将原本是线性时间提升到了对数时间范围,大大缩短了搜索时间,具有很大的应用场景,而在LeetCode中,要运用二分搜索法来解的题目也有很多,但是实际上二分查找法的查找目标有很多种,而且在细节写法也有一些变化.之前有网友留言希望博主能针对二分查找法的具体写法做个总结,博主由于之前一直很忙,一直拖着没写,为了树立博主言出必行的正面形象,不能再无限制的拖下去了,那么今天就来做个了断吧,总结写起来~ (以下内容均为博主自己的总结,并不权威,权当参考,欢迎各位大神们留言讨论…

题目标签:Binary Search 很标准的一个二分查找,具体看code. Java Solution: Runtime:  0 ms, faster than 100 % Memory Usage: 39 MB, less than 90 % 完成日期:07/31/2019 关键点:二分查找 class Solution { public int search(int[] nums, int target) { int left = 0; int right = nums.length -…

https://leetcode.com/problems/find-minimum-in-rotated-sorted-array/description/ leetcode 的题目,binary search 的变形.去在rotated array里找最小值. Idea:分析binary search 三种cases: 1. nums[mid] > nums[r]: remove the left part: l = mid+1          e.g. 2 3 4 5 1 2 2. nu…

Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the next smallest number in the BST. Note: next() and hasNext() should run in average O(1) time and uses…

原题链接在这里:https://leetcode.com/problems/binary-search-tree-iterator/ Implement an iterator over a binary search tree (BST). Your iterator will be initialized with the root node of a BST. Calling next() will return the next smallest number in the BST. N…

Winter is coming! Your first job during the contest is to design a standard heater with fixed warm radius to warm all the houses. Now, you are given positions of houses and heaters on a horizontal line, find out minimum radius of heaters so that all…