P3812 【模板】线性基

#include<cstdio>
#include<cstring>
#include<iostream>
#define ri register int
#define LL long long
#define N 100
using namespace std;

int n;
LL a[N];

struct set {
  LL b[N];
  void insert(LL c) {
    for (ri i=55;i>=0;i--) if (c&(1LL<<i)) {
      if (!b[i]) b[i]=c;
      c^=b[i];
    }
  }
  LL query(LL x) {
    for (ri i=55;i>=0;i--) x=max(x,x^b[i]);
    return x;
  }
} s;

int main() {
  scanf("%d",&n);
  for (ri i=1;i<=n;i++) scanf("%lld",&a[i]);
  for (ri i=1;i<=n;i++) s.insert(a[i]);
  printf("%lld",s.query(0));
  return 0;
}