Can you solve this real interview question? Find Peak Element - A peak element is an element that is strictly greater than its neighbors. Given a 0-indexed integer array nums, find a peak element, and return its index. If the array contains multiple pea
Leetcode之二分法专题-162. 寻找峰值(Find Peak Element) 峰值元素是指其值大于左右相邻值的元素。 给定一个输入数组 nums,其中 nums[i] ≠ nums[i+1],找到峰值元素并返回其索引。 数组可能包含多个峰值,在这种情况下,返回任何一个峰值所在位置即可。 你可以假设 nums[-1] = nums[n] = -∞。 示例1: 输...
Leetcode: Find Peak Element A peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠ num[i+1], find a peak element andreturnits index. The array may contain multiple peaks, in thatcasereturnthe index to any one of the peaks is fine. You...
A peak element is an element that is greater than its neighbors. num[i] ≠ num[i+1], find a peak element and return its index. The array may contain multiple peaks, in that case return the index to any one of the peaks is fine. num[-1] = num[n] = -∞.[1, 2, 3, 1], ...
https://leetcode.com/problems/find-peak-element/ 思路就是二分查找。如果mid在波峰的递减部分,那么e = mid - 1. 如果mid在波峰的递增部分,那么s = mid + 1. 如果mid在波峰,那么返回。 my code: 效率不高。 class Solution(object): def findPeakElement(self, nums): ...
leetcode-34. Find First and Last Position of Element in Sorte-binary-searchyjhycl 立即播放 打开App,流畅又高清100+个相关视频 更多 84 0 18:47 App leetcode-222-Counter Complete Binary Tree Nodes - binary search 2 0 10:00 App leetcode-852. Peak Index in a Mountain Array -binary-search...
http://siddontang.gitbooks.io/leetcode-solution/content/array/find_peak_element.html Paste_Image.png ** 总结: Array 凡是涉及到搜索的,而且要求复杂度是 log n 的, 一般都会涉及到, Binary Search!!! ** Anyway, Good luck, Richardo! 写出...
最简单的方法,循环遍历一遍,但是算法复杂度是O(n)。题目提示复杂度是O(logN),可以很容易地联想到二分,如果中点前面的值大于中点的值,则前面的区间必存在峰值,反之后面必存在,通过二分查找可以更高效地找到峰值。 具体实现: classFindPeakElement{funfindPeakElement(nums:IntArray):Int{returnfindPeakElement(nums,...
这种找Peak Element的首先想到的是binary search, 因为有更优的时间复杂度,否则brute forceO(n)的方法太直接了。 binary search的方法就是比较当前element与邻居,至于左邻居还是右邻居都可以,只要一致就行。不断缩小范围,最后锁定peak element. 这种类似题也有很多Follow up, 比如先增后减的数组怎么找指定元素,甚至...
LeetCode 162. Find Peak Element 简介:给定一个输入数组 nums,其中 nums[i] ≠ nums[i+1],找到峰值元素并返回其索引。数组可能包含多个峰值,在这种情况下,返回任何一个峰值所在位置即可。 Description A peak element is an element that is greater than its neighbors....