{"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\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$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript type\u003d\"text/javascript\" async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS_HTML-full\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cp\u003e在一艘小船上航行时,Inessa注意到湖面上方有一朵美丽的睡莲花。她靠近一看,发现睡莲正好在水面上方$$$H$$$厘米处。Inessa摘下花朵并航行了$$$L$$$厘米的距离。恰好在这一点上,花朵触及了水面。\u003c/p\u003e\u003ccenter\u003e \u003cimg class\u003d\"tex-graphics\" src\u003d\"CDN_BASE_URL/5af6cdd498bf9987af6ac5d2c8fd3164?v\u003d1709573740\" style\u003d\"max-width: 100.0%;max-height: 100.0%;\"\u003e \u003c/center\u003e\u003cp\u003e假设睡莲在湖底的某点$$$A$$$生长,它的茎始终是一条与点$$$A$$$有一个端点的直线段。还假设最初花朵正好在点$$$A$$$上方,即其茎是垂直的。你能确定点$$$A$$$处湖水的深度吗?\u003c/p\u003e"}},{"title":"输入","value":{"format":"HTML","content":"\u003cp\u003e仅一行包含两个整数$$$H$$$和$$$L$$$($$$1 \\le H \u0026lt; L \\le 10^{6}$$$)。\u003c/p\u003e"}},{"title":"输出","value":{"format":"HTML","content":"\u003cp\u003e输出一个数字,表示点$$$A$$$处湖水的深度。绝对误差或相对误差不应超过$$$10^{-6}$$$。\u003c/p\u003e\u003cp\u003e形式上,假设你的答案是$$$A$$$,评委的答案是$$$B$$$。只有当$$$\\frac{|A - B|}{\\max{(1, |B|)}} \\le 10^{-6}$$$时,你的答案才会被接受。\u003c/p\u003e"}},{"title":"示例 1","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\u003e1 2\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e1.5000000000000\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e"}},{"title":"示例 2","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\u003e3 5\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e2.6666666666667\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e"}}]}