[51nod] 2106 an odd number times

An odd number of times

Link

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Their thinking

If a number is also or twice , Then it is equivalent to no or .
There is only one odd number in the data , So all the numbers or one time , The result is an odd number of times .

code

#include<iostream>
#include<cstdio>
using namespace std;

int n,ans;

int main()
{
    
	cin>>n;
	for(int i=1;i<=n;i++)
	{
    
		int t;
		scanf("%d",&t);
		ans^=t;
	}
	printf("%d\n",ans);
}