Overview

The objective is to find the majority element in a given array. A majority element is an element that occurs more than n/2 times in a given array where n is the length of the array

Example 1

Input: [2, 1, 2, 2, 3]
Output: 2

Example 2

Input: [1]
Output: 1

Program

Below is the program for the same

package main

import "fmt"

func majorityElement(nums []int) int {
	lenNums := len(nums)

	if lenNums == 1 {
		return nums[0]
	}

	numsMap := make(map[int]int)

	for i := 0; i < lenNums; i++ {
		_, ok := numsMap[nums[i]]
		if ok {
			numsMap[nums[i]] = numsMap[nums[i]] + 1
			if numsMap[nums[i]] > lenNums/2 {
				return nums[i]
			}
		} else {
			numsMap[nums[i]] = 1
		}
	}

	return 0

}

func main() {
	output := majorityElement([]int{2, 1, 2, 2, 3})
	fmt.Println(output)

	output = majorityElement([]int{1})
	fmt.Println(output)
}

Output:

2
1

Note: Check out our Golang Advanced Tutorial. The tutorials in this series are elaborative and we have tried to cover all concepts with examples. This tutorial is for those who are looking to gain expertise and a solid understanding of golang – Golang Advance Tutorial

Also if you are interested in understanding how all design patterns can be implemented in Golang. If yes, then this post is for you – All Design Patterns Golang

Also, check out our system design tutorial series here – System Design Tutorial Series