{"trustable":false,"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":"\u003cscript type\u003d\u0027text/x-mathjax-config\u0027\u003eMathJax.Hub.Config({tex2jax: { inlineMath: [[\u0027$\u0027,\u0027$\u0027]] } }); \u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027 src\u003d\u0027https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\u0027\u003e\u003c/script\u003e\n\u003cscript type\u003d\u0027text/javascript\u0027\u003esetTimeout(function(){MathJax.Hub.Queue([\u0027Typeset\u0027, MathJax.Hub, \u0027left_view\u0027]);}, 2000);\u003c/script\u003e\n\u003cdiv class\u003d\"panel_content\"\u003e\n 为了能过个好年,xhd开始复习了,于是每天晚上背着书往教室跑。xhd复习有个习惯,在复习完一门课后,他总是挑一门更简单的课进行复习,而他复习这门课的效率为两门课的难度差的平方,而复习第一门课的效率为100和这门课的难度差的平方。xhd这学期选了n门课,但是一晚上他最多只能复习m门课,请问他一晚上复习的最高效率值是多少?\n \u003cbr\u003e\n\u003c/div\u003e"}},{"title":"输入","value":{"format":"HTML","content":"输入数据的第一行是一个数据T,表示有T组数据。\n\u003cbr\u003e每组数据的第一行是两个整数n(1 \u0026lt;\u003d n \u0026lt;\u003d 40),m(1 \u0026lt;\u003d m \u0026lt;\u003d n)。\n\u003cbr\u003e接着有n行,每行有一个正整数a(1 \u0026lt;\u003d a \u0026lt;\u003d 100),表示这门课的难度值。\n\u003cbr\u003e"}},{"title":"输出","value":{"format":"HTML","content":"对于每组输入数据,输出一个整数,表示最高效率值。\n\u003cbr\u003e"}},{"title":"输入样例","value":{"format":"HTML","content":"\u003cpre\u003e2\n2 2\n52\n25\n12 5\n89\n64\n6\n43\n56\n72\n92\n23\n20\n22\n37\n31\u003c/pre\u003e"}},{"title":"输出样例","value":{"format":"HTML","content":"\u003cpre\u003e5625\n8836 \u003c/pre\u003e"}}]}