[Solved] Best Couple Event with Java, C++, Python

Best Couple Event: “Shades” Television Channel organizes a fun-filled event named “Best Couple 2017”, where in married couples would be invited and given many tasks and activities. Based on some criteria decided by the jury, a best couple will be chosen.
N couples registered for the event and each couple was given a registration number(it may repeat). One specific couple’s registration Id got missed. The event coordinators wanted your help in finding the missing Id.
Write a program which takes an array of registration numbers as input and outputs the missing registration Id.

Input Format:
First line of the input contains the number of couples N who registered for the event. Assume that the maximum value for N as 50.
Second line of input contains N registration Id of each of the couple, separated by a space.

Output Format:
Output in a single line the missing registration Id.
Refer sample input and output for formatting specifications.

Sample Input 1:
3
1 2 1

Sample Output 1:
2

Sample Input 2:
5
1 1 2 2 3

Sample Output 2:
3

Solution

import java.util.*;

class Main 
{


	public static void main(String args[]) {

		Scanner in = new Scanner(System.in);

		int n = in.nextInt();

		int a[]=new int[n];

		int res=0;
		//sauravhathi
		for(int i=0;i<n;i++) {

			a[i]=in.nextInt();

			res=res^a[i];

		}

		System.out.println(res);

	}


}

#include <bits/stdc++.h>
using namespace std;

int main()
{
    int N;
    //sauravhathi
    cin >> N;
    int array[N];
    for (int i = 0; i < N; i++)
    {
        cin >> array[i];
    }
    int c = 0;
    sort(array, array + N);
    int i = 0;
    while (i < N)
    {
        c = 1;
        while (i < N - 1 && array[i] == array[i + 1])
        {
            c++;
            i++;
            //sauravhathi
        }
        if (c == 1)
        {
            cout << array[i] << " ";
        }
        i++;
    }
    return 0;
    //sauravhathi
}

n = int(input())
a = list(map(int, input().split()))
res = 0
for i in a:
#sauravhathi
    res = res ^ i
print(res)

Happy Learning – If you require any further information, feel free to contact me.