{"trustable":true,"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\n\u003cscript\u003e\n window.katexOptions \u003d {\n delimiters: [\n {left: \u0027$$$$$$\u0027, right: \u0027$$$$$$\u0027, display: true},\n {left: \u0027$$$\u0027, right: \u0027$$$\u0027, display: false},\n {left: \u0027$$\u0027, right: \u0027$$\u0027, display: true},\n {left: \u0027$\u0027, right: \u0027$\u0027, display: false}\n ]\n };\n\u003c/script\u003e\n","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003e你有一个长度为 $$$n$$$ 的数组 $$$w_1, w_2, \\ldots, w_n$$$。\u003c/p\u003e\u003cp\u003e你需要选择一个包含 $$$k$$$ 个元素的子序列。它们的索引为 $$$1 \\leq i_1 \u0026lt; i_2 \u0026lt; \\ldots \u0026lt; i_k \\leq n$$$。\u003c/p\u003e\u003cp\u003e你的目标是找到所有这样的子序列中 $$$$$$\\max \\left( (w_{i_1} + w_{i_2}), (w_{i_2} + w_{i_3}), \\ldots, (w_{i_{k - 1}} + w_{i_k}), (w_{i_k} + w_{i_1}) \\right)$$$$$$ 的最小可能值。\u003c/p\u003e"}},{"title":"输入","value":{"format":"HTML","content":"\u003cp\u003e输入的第一行包含两个整数 $$$n$$$ 和 $$$k$$$:数组 $$$w$$$ 中元素的数量和子序列的长度 ($$$3 \\leq k \\leq n \\leq 200\\,000$$$)。\u003c/p\u003e\u003cp\u003e第二行包含 $$$n$$$ 个用空格分隔的整数 $$$w_1, w_2, \\ldots, w_n$$$ ($$$1 \\leq w_i \\leq 10^9$$$)。\u003c/p\u003e"}},{"title":"输出","value":{"format":"HTML","content":"\u003cp\u003e打印一个整数:所有长度为 $$$k$$$ 的子序列中 $$$$$$\\max \\left( (w_{i_1} + w_{i_2}), (w_{i_2} + w_{i_3}), \\ldots, (w_{i_{k - 1}} + w_{i_k}), (w_{i_k} + w_{i_1}) \\right)$$$$$$ 的最小可能值。\u003c/p\u003e"}},{"title":"示例","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\u003e5 3\n17 18 17 30 35\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e35\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e"}}]}