题解 | 寻找峰值

import java.util.*;


public class Solution {
    
    public int findPeakElement (int[] nums) {
        int l = 0 ;
        int r = nums.length -1;
        while(l < r){
            //默认下取整，是左闭右开；配合 r = mid;
            //上取整，配合r = mid -1
            int mid = l + (r - l + 1)/2;
            if(nums[mid] > nums[mid - 1]){
                l = mid;
            }else{
                r = mid -1 ;
            }
        }
        return l;
    }
}