二分探索アプローチを使用して配列のピーク要素を見つけるC++プログラム

このC++プログラムでは、バイナリ検索アプローチを使用して、配列のピークの1つを見つけることができます。このアルゴリズムは、アルゴリズムの時間計算量がO（log（n））である結果として見つかった最初のピークを返します。

アルゴリズム

Begin
   PeakElement() function has ‘arr’ the array of data, start and end index in the argument list.
   Assign the mid of subpart of the array.
   If mid is at the boundary index and value at mid is higher than its neighbor then return mid as peak.
   If the value at mid is greater than both of its neighbors then return mid as peak.
   If the value at the right of mid is greater than mid then send second sub-part of the array into PeakElement() as argument.
   If the value at the left of mid is greater than mid then send first sub-part of the array into PeakElement() as argument.
End

サンプルコード

#include<iostream>
using namespace std;
int PeakElement(int a[], int start, int end) {
   int i, mid;
   mid = (end+start+1)/2;
   if((a[mid] > a[mid+1] && mid == start)||(a[mid] > a[mid-1] && mid == end)) {
      return a[mid];
   } else if(a[mid] < a[mid-1] && a[mid] > a[mid+1]) {
      return a[mid];
   } else if(a[mid] <= a[mid+1]) {
      return PeakElement(a, mid+1, end);
   } else if(a[mid] <= a[mid-1]) {
      return PeakElement(a, start,mid-1);
   }
}
int main() {
   int n, i, p;
   cout<<"\nEnter the number of data element: ";
   cin>>n;
   int arr[n];
   for(i = 0; i < n; i++) {
      cout<<"Enter element "<<i+1<<": ";
      cin>>arr[i];
   }
   p = PeakElement(arr, 0, n-1);
   cout<<"\nThe peak element of the given array is: "<<p;
   return 0;
}

出力

Enter the number of data element: 5
Enter element 1: 45
Enter element 2: 26
Enter element 3: 70
Enter element 4: 60
Enter element 5: 15
The peak element of the given array is: 70