[LeetCode] LeetCode162. 寻找峰值

题目描述

思路:同LeetCode852.山脉数组的顶峰索引

注意：当nums数组只有一个元素的时候，这个元素就是顶元素
因为根据题目：nums[-1] = nums[n] = -∞

方法一:

class Solution {
    public int findPeakElement(int[] nums) {
        if (nums.length == 1) return 0;
        int left = 0, right = nums.length - 1;
        while (left <= right) {
            if (left == right) return left;
            int mid = left + (right - left) / 2;
            if (nums[mid] < nums[mid + 1]) {
                left = mid + 1;
            } else if (nums[mid] > nums[mid + 1]) {
                right = mid;
            }
        }
        throw new RuntimeException("Error");
    }
}