{"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一个地区有很多树。一位农民想买一根绳子把这些树围起来。所以首先他必须知道绳子的最小长度。然而,他不知道如何计算。你能帮助他吗?\n \u003cbr\u003e树的直径和长度被省略,这意味着树可以被看作一个点。绳子的厚度也被省略,这意味着绳子可以被看作一条线。\n \u003cbr\u003e\n \u003cbr\u003e\n \u003ccenter\u003e\n \u003cimg style\u003d\"max-width:100%;\" src\u003d\"CDN_BASE_URL/9426b66e356d9461caf704dc6d111b17?v\u003d1617906609\"\u003e\n \u003c/center\u003e\n \u003cbr\u003e\n \u003cbr\u003e保证输入不超过100棵树\n \u003cbr\u003e\n\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"输入包含一个或多个数据。每个输入的第一行n是该测试样例中的树的数量,然后是树的坐标(x,y)。每个坐标都是正整数对,每个整数都小于32767。每一对用空格隔开。\n\u003cbr\u003e\n\u003cbr\u003e当n\u003d\u003d0时,程序结束。\n\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":"输出需要绳子的最小长度,与答案的标准误差不超过0.01\n\u003cbr\u003e"}},{"title":"Sample Input","value":{"format":"HTML","content":"\u003cpre\u003e9 \n12 7 \n24 9 \n30 5 \n41 9 \n80 7 \n50 87 \n22 9 \n45 1 \n50 7 \n0 \u003c/pre\u003e"}},{"title":"Sample Output","value":{"format":"HTML","content":"\u003cpre\u003e243.06\u003c/pre\u003e"}}]}