{"trustable":false,"prependHtml":"\u003cstyle type\u003d\u0027text/css\u0027\u003e\n .input, .output {\n border: 1px solid #888888;\n }\n .output {\n margin-bottom: 1em;\n position: relative;\n top: -1px;\n }\n .output pre, .input pre {\n background-color: #EFEFEF;\n line-height: 1.25em;\n margin: 0;\n padding: 0.25em;\n }\n \u003c/style\u003e\n \u003clink rel\u003d\"stylesheet\" href\u003d\"//codeforces.org/s/96598/css/problem-statement.css\" type\u003d\"text/css\" /\u003e\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 type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"给你一个长度为n的数组a,让你找出一个整数x,使得:数组中的每一个数都减去x再取绝对值,然后对数组排序,让第k + 1个数尽可能小。"}},{"title":"Input","value":{"format":"HTML","content":"第一行包含一个整数T,表示数据组数\u003c/p\u003e\n每组数据中,第一行两个整数n, k。1 \u003c\u003d n \u003c\u003d 2e5, 0 \u003c\u003d k \u003c n\u003c/p\u003e\n第二行n个整数表示a1, a2....an 1 \u003c\u003d a1 \u003c a2 \u003c .. \u003c an \u003c\u003d 1e9\u003c/p\u003e\n保证所有数据中的n加起来不超过2e5\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"输出一个整数x回答每一组输入,如果有多种答案,输出任意一个"}},{"title":"Example","value":{"format":"HTML","content":"\u003cdiv class\u003d\"sample-test\"\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Input\n \u003c/div\u003e\n \u003cpre\u003e3\n3 2\n1 2 5\n2 1\n1 1000000000\n1 0\n4\n\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n Output\n \u003c/div\u003e\n \u003cpre\u003e3\n500000000\n4\n\u003c/pre\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}}]}