Find maximum element in sorted array

20.cpp

void find(vector<int> a, int low, int high){
  if(high == low+1 && a[low] <= a[high]) return a[high];
  if(high == low+1 && a[low] >= a[high]) return a[low];
  int mid = (low + high)/2;
  if(a[low] < a[mid] && a[mid] > a[high]) return a[mid];
  if(a[mid-1] < a[mid] && a[mid] < a[mid+1]) return find(a,low,mid-1);
  else return find(a,mid+1, high);
}