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题目链接：162. 寻找峰值

看思路图：

class Solution {
public:int findPeakElement(vector<int>& nums) {int left = 0,right = nums.size()-1;while(left<right){int mid = left + (right-left)/2;if(nums[mid]>nums[mid+1]){right = mid;}else if(nums[mid]<nums[mid+1]){left = mid+1;}}return left;}
};