题解 | #寻找峰值#

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 
     * @param nums int整型一维数组 
     * @return int整型
     */
    public int findPeakElement (int[] nums) {
        // write code here

        if(nums.length == 1) return 0;
        if(nums[0]>nums[1]) return 0;
        if(nums[nums.length-1]>nums[nums.length-2]) return nums.length-1;
        int left=1, right=nums.length-2;
        int mid = (right+left)/2;
        while(left<=right){
            mid = (right+left)/2;
            if(nums[mid]>nums[left]&&nums[mid]>nums[right]) return mid;
            else if(nums[mid]<nums[right]){
                left = mid+1;
            }
            else {
                right = mid-1;
            }
        }
        return mid;
    }

}

二分查找峰值

需要处理边缘峰值情况