{"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":"一个序列s,一开始只有一个数字1.\u003cbr\u003e\n每一次操作.\u003cbr\u003e\ns \u003d s + mex{s} + s.\u003cbr\u003e\n(其中max{s}表示序列s中没有出现的最小正整数).\u003cbr\u003e\n如操作一次,{1}-\u003e{1,2,1}.\u003c/br\u003e\n再操作一次,{1,2,1,3,1,2,1}.\u003c/br\u003e\n现在问你,n-1次操作之后,序列s中位置为k的数字是什么,"}},{"title":"Input","value":{"format":"HTML","content":"第一行,两个整数n,k(1\u003c\u003dn\u003c\u003d50,1\u003c\u003dk\u003c\u003d2^n-1)."}},{"title":"Output","value":{"format":"HTML","content":"输出一个数字,表示n-1次操作之后,第k个位置的数字。"}},{"title":"Example","value":{"format":"HTML","content":"\u003cstyle type\u003d\u0027text/css\u0027\u003e .input, .output {border: 1px solid #888888;} .output {margin-bottom:1em;position:relative;top:-1px;} .output pre,.input pre {background-color:#EFEFEF;line-height:1.25em;margin:0;padding:0.25em;} .title {background-color:#FFFFFF;border-bottom: 1px solid #888888;font-family:arial;font-weight:bold;padding:0.25em;} \u003c/style\u003e\u003cdiv class\u003d\"sample-tests\"\u003e\n \u003cdiv class\u003d\"section-title\"/div\u003e\n \u003cdiv class\u003d\"sample-test\"\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n输入1\n \u003c/div\u003e\n \u003cpre\u003e3 2\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n输出1\n \u003c/div\u003e\n \u003cpre\u003e2\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"input\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n输入2\n \u003c/div\u003e\n \u003cpre\u003e4 8\u003cbr\u003e\u003c/pre\u003e\n \u003c/div\u003e\n \u003cdiv class\u003d\"output\"\u003e\n \u003cdiv class\u003d\"title\"\u003e\n输出2\n \u003c/div\u003e\n \u003cpre\u003e4\u003c/pre\u003e\n \u003c/div\u003e\n \u003c/div\u003e\n\u003c/div\u003e"}},{"title":"解释","value":{"format":"HTML","content":"2次操作后,s \u003d[1, 2, 1, 3, 1, 2, 1] \u003c/br\u003e\n3次操作后,s \u003d [1, 2, 1, 3, 1, 2, 1, 4, 1, 2, 1, 3, 1, 2, 1]"}}]}