Mountain Array (DSA)

Finding the peak element in the mountain array using binary search.

(Data Structures and Algorithms)

#include<iostream>

using namespace std;

void MountSearch (int arr[], int size )

{

int start = 0, end = size-1;

int index = 0;

for(int mid = start + (end-start)/2; start <= end; mid = start + (end-start)/2 )

{

if(arr[mid-1]<arr[mid] && arr[mid]>arr[mid+1])

{

index = mid;

break;

}

else if(arr[mid]<arr[mid+1])

{ start = mid+1; }

else if(arr[mid-1]>arr[mid])

{ end = mid; }

}

cout<<"The index of the peak is: "<<index;

}

int main ()

{

int arr[9] = {0,1,2,4,5,3,2,1,0};

MountSearch(arr,9);

return 0;

}

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