{"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":"n个数,k次操作。每次操作必须选择一个数ai乘上-1,也即将ai变成-ai。\n"}},{"title":"Input","value":{"format":"HTML","content":"T组输入。(1\u003c\u003dT\u003c\u003d100)\n每组数据第一行包含两个整数n,k。其中n是数组长度,k是操作次数。(1\u003c\u003dn\u003c\u003d10000,0\u003c\u003dk\u003c\u003d10000)\n接下来一行包含n个数ai。(-100\u003c\u003dai\u003c\u003d100)"}},{"title":"Output","value":{"format":"HTML","content":"对于每个测试数据,输出一个整数表示经过k次操作后最大的数组和。"}},{"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 1\n4 6 2\n4 2\n-1 0 2 1\n5 2\n1 7 -4 2 -3\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\u003e8\n4\n17\n\u003c/pre\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}},{"title":"Note","value":{"format":"HTML","content":"第一个测试数据中,将2变成-2,数组和为4+6-2\u003d8。\n\n第二个测试数据中,将-1变成1,将0变成0,数组和为1+0+2+1\u003d4。\n\n第三个测试数据中,将-4变成4,将-3变成3,数组和为1+7+4+2+3\u003d17。"}}]}