码迷,mamicode.com
首页 > 其他好文 > 详细

162. Find Peak Element

时间:2020-04-05 23:55:14      阅读:59      评论:0      收藏:0      [点我收藏+]

标签:Plan   vector   NPU   tput   case   mem   exp   strong   should   

Problem:

A peak element is an element that is greater than its neighbors.

Given an input array nums, where nums[i] ≠ nums[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.

You may imagine that nums[-1] = nums[n] = -∞.

Example 1:

Input: nums = [1,2,3,1]
Output: 2
Explanation: 3 is a peak element and your function should return the index number 2.

Example 2:

Input: nums = [1,2,1,3,5,6,4]
Output: 1 or 5 
Explanation: Your function can return either index number 1 where the peak element is 2, 
             or index number 5 where the peak element is 6.

Note:

Your solution should be in logarithmic complexity.

思路

Solution (C++):

int findPeakElement(vector<int>& nums) {
    int n = nums.size(), i;
    if (n == 1 || nums[0] > nums[1])  return 0;
    for (i = 1; i < n-1; ++i) {
        if (nums[i] > nums[i-1] && nums[i] > nums[i+1])  return i;
    }
    if (nums[n-1] > nums[n-2])  return n-1;
    return i;
}

性能

Runtime: 4 ms??Memory Usage: 6.5 MB

思路

Solution (C++):


性能

Runtime: ms??Memory Usage: MB

162. Find Peak Element

标签:Plan   vector   NPU   tput   case   mem   exp   strong   should   

原文地址:https://www.cnblogs.com/dysjtu1995/p/12640001.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有 京ICP备13008772号-2
迷上了代码!