How to Fix Find Peak Element Errors

In this tutorial, you'll learn about How to Fix Find Peak Element Errors. We cover key concepts, practical examples, and best practices.

Fix find peak element errors when comparing with neighbors outside bounds or missing O(log n) approach.

Quick Fix

Wrong

def peak(a):
    for i in range(len(a)):
        if (i==0 or a[i]>a[i-1]) and (i==len(a)-1 or a[i]>a[i+1]):
            return i
    return -1

O(n) linear scan. Doesn't use binary search for guaranteed peak.

Right

def peak(a):
    l=0; r=len(a)-1
    while l<r:
        m=l+(r-l)//2
        if a[m]>a[m+1]: r=m
        else: l=m+1
    return l

[1,2,3,1] -> index 2 (value 3). O(log n).

Prevention

Binary search: if mid > mid+1, peak is in left half (including mid). Otherwise in right half.

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