{"trustable":true,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv class\u003d\"panel_content\"\u003eJohn is a manager of a CPU chip factory, the factory produces lots of chips everyday. To manage large amounts of products, every processor has a serial number. More specifically, the factory produces $n$ chips today, the $i$-th chip produced this day has a serial number $s_i$.\u003cbr\u003e\u003cbr\u003eAt the end of the day, he packages all the chips produced this day, and send it to wholesalers. More specially, he writes a checksum number on the package, this checksum is defined as below:\u003cbr\u003e$$\\max_{i,j,k} (s_i+s_j) \\oplus s_k$$\u003cbr\u003ewhich $i,j,k$ are three \u003cb\u003edifferent\u003c/b\u003e integers between $1$ and $n$. And $\\oplus$ is symbol of bitwise XOR.\u003cbr\u003e\u003cbr\u003eCan you help John calculate the checksum number of today?\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"The first line of input contains an integer $T$ indicating the total number of test cases.\u003cbr\u003e\u003cbr\u003eThe first line of each test case is an integer $n$, indicating the number of chips produced today. The next line has $n$ integers $s_1, s_2, .., s_n$, separated with single space, indicating serial number of each chip.\u003cbr\u003e\u003cbr\u003e$1 \\le T \\le 1000$\u003cbr\u003e$3 \\le n \\le 1000$\u003cbr\u003e$0 \\le s_i \\le 10^9$\u003cbr\u003eThere are at most $10$ testcases with $n \u0026gt; 100$ "}},{"title":"Output","value":{"format":"HTML","content":"For each test case, please output an integer indicating the checksum number in a line."}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e2\r\n3\r\n1 2 3\r\n3\r\n100 200 300\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e6\r\n400\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}