Lucy at the Film Festival

  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

C coding

#include<stdio.h>

int main()

{

int n,i,count=0,j,a[50];

scanf("%d",&n);

for(i=0;i<n;i++){

scanf("%d",&a[i]);

}

for(i=0;i<n;i++){

for(j=0;j<n;j++){

if(a[i]==a[j]){

count++;

}

}

if(count%2!=0){

printf("%d",a[i]);

}

count=0;

}

return 0;

}