class Solution { public: int peakIndexInMountainArray(vector<int>& arr) { int st=0, end=arr.size()-1; int mid=st+(end-st)/2; while(st<=end) { if(arr[mid]>arr[mid-1]&&arr[mid]>arr[mid+1]) return mid; if(arr[mid]<arr[mid+1]) st=mid+1; else if(arr[mid]<arr[mid-1]) end=mid; mid=st+(end-st)/2; } return mid; } };
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