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findPeakElement.js
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31 lines (26 loc) · 791 Bytes
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/**
* Given an integer array nums, find a peak element, and return its index. If the array contains multiple peaks, return the index to any of the peaks.
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: 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.
*/
/**
* @param {number[]} nums
* @return {number}
*/
var findPeakElement = function (nums) {
let left = 0,
right = nums.length - 1,
mid;
while (left < right) {
mid = Math.floor((right + left) / 2);
if (nums[mid] > nums[mid + 1]) right = mid;
else left = mid + 1;
}
return left;
};