A peak element is an element that is greater than its neighbors.
Given an input array where numi ≠ numi+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 num-1 = numn = -∞.
For example, in array 1, 2, 3, 1, 3 is a peak element and your function should return the index number 2.
Note:
Your solution should be in logarithmic complexity.
Credits:
Special thanks to @ts for adding this problem and creating all test cases.
public int findPeakElement(int[] nums) {
int low = 0;
int high = nums.length - 1;
while (low < high) {
int mid = low + (high - low) / 2;
if (nums[mid] > nums[mid + 1]) {
high = mid;
} else {
low = mid + 1;
}
}
return low;
}
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原创声明:本文系作者授权腾讯云开发者社区发表,未经许可,不得转载。
如有侵权,请联系 cloudcommunity@tencent.com 删除。