题解 | #寻找峰值#

class Solution {
public:
    /**
     * 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vector 
     * @return int整型
     */
    int findPeakElement(vector<int>& nums) {
        // write code here
        nums.push_back(INT_MIN);
        int left=0;
        int right=nums.size()-1;
        int mid=0;
        int lastmid=-1;
        while(left<=right){
            mid=left+right;
            mid/=2;
            if(nums[mid]>nums[mid+1]){
                //-
                right=mid-1;
                lastmid=mid;
            }
            else{
			  	//+
                left=mid+1;
            }
        }
        return lastmid;
    }
};