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Create Boyer-Moore Majority Voting Algorithm (C++) #292

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c57ed6b
Create Boyer-Moore Majority Voting Algorithm
bose-aritra2003 Jul 2, 2022
a18cad1
Update majority-element.cpp
bose-aritra2003 Jul 2, 2022
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41 changes: 41 additions & 0 deletions Competitive Coding/Search/majority-element.cpp
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Original file line number Diff line number Diff line change
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// C++ implementation of Boyer-Moore Majority Voting Algorithm
#include <iostream>
using namespace std;

// Function to find majority element
int findMajority(int arr[], int n)
{
int i, candidate = -1, votes = 0;
// Finding majority candidate
for (i = 0; i < n; i++) {
if (votes == 0) {
candidate = arr[i];
votes = 1;
}
else {
if (arr[i] == candidate)
votes++;
else
votes--;
}
}
int count = 0;
// Checking if majority candidate occurs more than n/2
// times
for (i = 0; i < n; i++)
if (arr[i] == candidate)
count++;

if (count > n / 2)
return candidate;
return -1;
}

int main()
{
int arr[] = { 1, 1, 1, 1, 2, 3, 4 };
int n = sizeof(arr) / sizeof(arr[0]);
int majority = findMajority(arr, n);
cout << " The majority element is : " << majority;
return 0;
}