Codeforces Round #383 (Div. 2), problem: (B) Arpa’s obvious problem and Mehrdad’s terrible solution , Solution in C/C++

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Codeforces Round #383 (Div. 2), problem: (B) Arpa’s obvious problem and Mehrdad’s terrible solution , Solution in C/C++
Codeforces Round #383 (Div. 2), problem: (B) Arpa’s obvious problem and Mehrdad’s terrible solution , Solution in C/C++
#include<stdio.h>
int v[1500010];
int main(){
	int i,l,n,x;
	long long int r;
	scanf("%d%d",&n,&x);
	for(i=0;i<n;i++)
	{
		scanf("%d",&l);
		r=r+v[l^x];
		v[l]++;
	}
	printf("%I64d",r);
	return 0;
}

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