Boyer Moore Voting
Detailed guide and Python implementation for the 'Boyer Moore Voting' problem.
Problem Statement
Write a function boyer_moore_majority(arr) that implements the Boyer-Moore Majority Vote Algorithm to find the majority element (the element that appears more than n // 2 times) in a list of integers arr. If no majority element exists, return -1.
- •1 <= len(arr) <= 5 * 10^4
- •-10^9 <= arr[i] <= 10^9
Examples
arr = [1, 1, 1, 2, 2]
1
1 appears 3 times which is greater than 5 // 2 = 2 times.
arr = [1, 2, 3]
-1
No element appears more than 3 // 2 = 1 time.
Need a Hint?
Edge Cases to Watch
- Empty input structures
- Single element inputs
- Large numerical bounds
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