记录编号	204199	评测结果	AAAAAAAAAA
题目名称	平凡的数据范围	最终得分	100
用户昵称	dashgua	是否通过	通过
代码语言	C++	运行时间	0.011 s
提交时间	2015-11-03 23:26:14	内存使用	0.39 MiB

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <ctime>
#include <vector>
#include <utility>
#include <stack>
#include <queue>
#include <iostream>
#include <algorithm>

template<class Num>void read(Num &x)
{
	char c; int flag = 1;
    while((c = getchar()) < '0' || c > '9')
		if(c == '-') flag *= -1;
	x = c - '0';
    while((c = getchar()) >= '0' && c <= '9')
		x = (x<<3) + (x<<1) + (c-'0');
	x *= flag;
	return;
}
template<class Num>void write(Num x)
{
	if(!x) {putchar('0');return;}
    if(x < 0) putchar('-'), x = -x;
	static char s[20];int sl = 0;
	while(x) s[sl++] = x%10 + '0',x /= 10;
	while(sl) putchar(s[--sl]);
}

const int maxn = 10030, size = 100;

int N, bs;
long long a[maxn], b[size], ans;

int main()
{
	freopen("xor_equ.in","r",stdin);
	freopen("xor_equ.out","w",stdout);
	
	read(N);
	
	for(int i = 1; i <= N; i++) read(a[i]);
	
	for(int i = 63; i >= 0; i--)
	{
		bool flag = false;
		
		for(int j = 1; j <= N; j++)
			if((a[j] >> i) & 1)
			{
				flag = true;
				b[++bs] = a[j];
				break;
			}
		
		if(!flag) continue;
		
		for(int j = 1; j <= N; j++)	
			if((a[j] >> i) & 1) a[j] ^= b[bs];
		
		for(int j = 1; j < bs; j++)
			if((b[j] >> i) & 1) b[j] ^= b[bs];
	}
	
	for(int i = 1; i <= bs; i++) ans ^= b[i];
	
	write(ans);
	
	fclose(stdin);
	fclose(stdout);
	return 0;
}