[{"sectionTitle":"题目描述","type":"Text","text":"在给定的 $N$ 个整数 $A_1,A_2,…,A_N$ 中选出两个进行异或运算，得到的结果最大是多少？","subType":"markdown"},{"sectionTitle":"输入格式","type":"Text","text":"第一行一个整数 $N$。\r\n\r\n第二行 $N$ 个整数 $A_i$。","subType":"markdown"},{"sectionTitle":"输出格式","type":"Text","text":"一个整数表示答案。","subType":"markdown"},{"sectionTitle":"样例","type":"Sample","text":"","subType":"markdown","payload":["5\n2 9 5 7 0","14"]},{"sectionTitle":"数据范围与提示","type":"Text","text":"对于 $100\\%$ 的数据，$1\\le N\\le 10^5, 0\\le A_i <2^{31}$。","subType":"markdown"}]