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Majority Element in C++
Suppose we have an array; we have to check whether given number x is the majority element of that array or not. The array is sorted. One element is said to be the majority element when it appears n/2 times in the array. Suppose an array is like {1, 2, 3, 3, 3, 3, 6}, x = 3, here the answer is true as 3 is the majority element of the array. There are four 3s. The size of the array is 7, so we can see 4 > 7/2.
We can count the occurrences of x in the array, and if the number is greater than n/2, the answer will be true, otherwise false.
Example (C++)
#include <iostream>
#include <stack>
using namespace std;
bool isMajorityElement(int arr[], int n, int x){
int freq = 0;
for(int i = 0; i<n; i++){
if(arr[i] == x )
freq++;
if(arr[i] > x)
break;
}
return (freq > n/2);
}
int main() {
int arr[] = {1, 2, 3, 3, 3, 3, 6};
int n = sizeof(arr)/sizeof(arr[0]);
int x = 3;
if (isMajorityElement(arr, n, x))
cout << x << " is the majority element of the array";
else
cout << x << " is not the majority element of the array";
}Input
[1, 2, 3, 3, 3, 3, 6] 3
Output
3 is the majority element of the array
Updated on: 28-Apr-2020
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