{"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":"\u003cp\u003eHadi and Abdulaziz were playing a game. \nThey each have a paper containing the \u003cb\u003esame\u003c/b\u003e exact word which consists of \u003cb\u003elowercase\u003c/b\u003e letters. \nThey cut up their papers into smaller pieces, each piece of paper containing \u003cb\u003eexactly 1 letter\u003c/b\u003e. \nAfterward, they put the pieces of paper in their pockets. Then proceeded to take out \u003cb\u003erandom\u003c/b\u003e pieces of paper from their pockets to check if they picked the \u003cb\u003esame letter\u003c/b\u003e. \n\u003cbr\u003e\u003cbr\u003eGiven the original string, output the \u003cb\u003eexpected\u003c/b\u003e amount of times Hadi and Abdulaziz will get the \u003cb\u003esame letter.\u003c/b\u003e\u003c/p\u003e\n"}},{"title":"Input","value":{"format":"HTML","content":"\u003cp\u003eString \u003ci\u003es\u003c/i\u003e, which was initially written on their papers.\u003cbr\u003e\n\u003cb\u003e1\u003c\u003ds.length\u003c\u003d 200000\u003c/b\u003e\u003cbr\u003e\nThe string consists of lowercase letters.\u003c/p\u003e"}},{"title":"Output","value":{"format":"HTML","content":"\u003cp\u003e\nThe \u003cb\u003eestimated\u003c/b\u003e amount of times Hadi and Abdulaziz got the same letter\n\u003cbr\u003e\nThe relative error of the answer should not exceed 10\u003csup\u003e-9\u003c/sup\u003e.\n\u003c/p\u003e"}},{"title":"Sample 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\u003eabc\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e1.000000000000000\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}},{"title":"Sample 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\u003ezzz\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e3.000000000000000\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}